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Search: Posts Made By: jac mac
Forum: Wings, Wheels, and Keels 16th July 2018, 06:48 AM
Replies: 248
Views: 43,061
Posted By jac mac
Re: McCopy mk 5

Good to hear the extenders will help, If you ended up having to move the ~25mm to get it right on that one side then you will need that 25mm amount of extension at each end of the rack to allow for...
Forum: The Paddock 15th July 2018, 05:12 PM
Replies: 30
Views: 518
Posted By jac mac
Re: It it allowed?

Ferrari!!!!?
Forum: Wings, Wheels, and Keels 14th July 2018, 06:13 PM
Replies: 248
Views: 43,061
Posted By jac mac
Re: McCopy mk 5

Road frontage has been tidied up a bit since your last visit Russell, still exit SH1 @ same point but gate is ~70m west toward Gore, and gradient a bit more vehicle friendly! With a wet winter you...
Forum: Wings, Wheels, and Keels 14th July 2018, 02:28 AM
Replies: 248
Views: 43,061
Posted By jac mac
Re: McCopy mk 5

Sorry, mine are Supra. Quick check to see if I am on right track, turn steering wheel to left so rack moves ~20mm toward wheel, then without moving rack adjust that LH tie rod end inward until LH...
Forum: Wings, Wheels, and Keels 13th July 2018, 11:34 PM
Replies: 248
Views: 43,061
Posted By jac mac
Re: McCopy mk 5

Have got a couple of those uprights here, will check ackerman on those and get back to you. If it has akerman your rack will likely need extended by that amount at each end. On those pics height does...
Forum: Wings, Wheels, and Keels 13th July 2018, 11:15 PM
Replies: 248
Views: 43,061
Posted By jac mac
Re: McCopy mk 5

Looks like the rack needs to be lengthened, can you take similar pic from further away to reduce the divergence? error in that image, needs to include both top/bottom ball joints plus chassis mounts .
Forum: GT40 Tech - Engines/Induction/Exhaust 12th July 2018, 05:07 PM
Replies: 15
Views: 470
Posted By jac mac
Re: Connecting rod to stroke ratio

Not many proof readers @ the Hot Rod Network! No reason other than $$$ and lack of talent in that 363 build which could have been done with pistons/rods as I described in posts 8 & 10 above.
Forum: GT40 Tech - Engines/Induction/Exhaust 12th July 2018, 03:41 AM
Replies: 15
Views: 470
Posted By jac mac
Re: Connecting rod to stroke ratio

Were they 6cyl hemi rods, they will be 6.00" long and 2.00" rod journal, so offset grind the 351 crank to get the ~ 387 cu in with around 1.59 rod ratio. by the same token you can get the AU 302 rod...
Forum: GT40 Tech - Engines/Induction/Exhaust 10th July 2018, 09:09 PM
Replies: 15
Views: 470
Posted By jac mac
Re: Connecting rod to stroke ratio

In text above, from comments being made on this thread most seem to have it back to front, eg living with whats available rather than getting the max rod length able to be fitted and then work out...
Forum: GT40 Tech - Engines/Induction/Exhaust 10th July 2018, 06:37 PM
Replies: 15
Views: 470
Posted By jac mac
Re: Connecting rod to stroke ratio

347 with 5.625 rod, only way to go with 347. 1.65 rod ratio.
Forum: GT40 Tech - Engines/Induction/Exhaust 4th July 2018, 06:17 PM
Replies: 15
Views: 562
Posted By jac mac
Re: 331 v 347 Thoughts

302 = 1.696, 331 = 1.661, 347 = 1.588.

Which is best?
Forum: GT40 Build Logs 30th June 2018, 07:54 AM
Replies: 3
Views: 229
Posted By jac mac
Re: Project GTX

Original Post'er.... the guys who started the thread and the GTX group, think they are/were based in South America somewhere from memory. Send them a Private Message or Email if they have not posted...
Forum: GT40 Build Logs 30th June 2018, 05:18 AM
Replies: 3
Views: 229
Posted By jac mac
Re: Project GTX

Try contacting the OP's.
Forum: Original GT40s 30th June 2018, 05:17 AM
Replies: 28
Views: 945
Posted By jac mac
Re: Mk1 vs Mk2 Mono

Not many, Differences Im aware of: lower bulkhead in front of engine has extra clearance for the longer FE engine block & pulleys etc, IIRC coolant lines run down LHS of cockpit ( might be only MKIIB...
Forum: GT40 Tech - Engines/Induction/Exhaust 25th June 2018, 05:21 PM
Replies: 12
Views: 360
Posted By jac mac
Forum: The Paddock 22nd June 2018, 08:19 PM
Replies: 69
Views: 1,880
Posted By jac mac
Re: Will There Be a Paddock on the New GT40s.com?

Pretty sure Keith & perhaps Molluer along with myself have not got or had a GT40, unless the scale one in the cabinet counts!, just sayin!
Forum: GT40 Tech - Engines/Induction/Exhaust 30th May 2018, 05:59 AM
Replies: 21
Views: 624
Posted By jac mac
Re: Request for advice re Holley 4150

Disconnect & plug that vac advance like it was before before you ' stuff it', the extra advance is too much and your carb /manifold combo are quite small for 427ci so its likely the vac advance when...
Forum: GT40 Tech - Engines/Induction/Exhaust 30th May 2018, 12:35 AM
Replies: 21
Views: 624
Posted By jac mac
Re: Request for advice re Holley 4150

Some of you guys make it hard work, anything modified with big cam or headers I just fit blanking plugs in place of power valve/s then take manifold vac reading and select suitable PV from there....
Forum: All GT40 27th May 2018, 07:27 PM
Replies: 14
Views: 751
Posted By jac mac
Re: Please post answer/update

I think you will find in many of those cases the person is attempting to make money from helping or selling goods/services to the initial poster without drawing attention from moderators.
Forum: GT40 Tech - Engines/Induction/Exhaust 26th May 2018, 05:15 PM
Replies: 21
Views: 624
Posted By jac mac
Re: Request for advice re Holley 4150

From your comments it sounds like its real rich at idle, check your idle manifold pressure ( Vacuum for non aviation people ) and reference it to your power valve number, it may be low enough that...
Forum: Original GT40s 23rd May 2018, 11:39 PM
Replies: 15
Views: 1,014
Posted By jac mac
Re: Rear support hoop upper shock/spring mounts

1046 is a FE/427 engine car and presumably T44 transaxle which would explain different shape of horseshoe top link.
Forum: GT40 Cars For Sale 22nd May 2018, 10:35 PM
Replies: 30
Views: 4,594
Posted By jac mac
Re: FORD GT40 GELSCOE 1969 specs

According o Ronnie Spain book only car with alloy tub is GT110, the open top sports car. Alan Mann cars had alloy roof /spyder and firewall along with a lot of other weight reducing bits, BUT still...
Forum: GT40 Tech - Powertrain/Transaxles 20th May 2018, 05:04 PM
Replies: 8
Views: 348
Posted By jac mac
Re: Driveline phasing and angles explanation - Great video!

Hi Ian, The rubber doughnut can be considered to be a CV joint, but with the added feature of being able to absorb any shaft speed differences that are induced when the outer U-Joint runs at any...
Forum: GT40 Tech - Powertrain/Transaxles 20th May 2018, 04:58 PM
Replies: 8
Views: 348
Posted By jac mac
Re: Driveline phasing and angles explanation - Great video!

Hi Ian, The rubber doughnut can be considered to be a CV joint, but with the added feature of being able to absorb any shaft speed differences that are induced when the outer U-Joint runs at any...
Forum: GT40 Tech - Powertrain/Transaxles 19th May 2018, 08:47 PM
Replies: 8
Views: 348
Posted By jac mac
Re: Driveline phasing and angles explanation - Great video!

Wont need to with CV joints Walt, only U-joints or any combo with a U-joint.
Forum: The Paddock 19th May 2018, 09:45 AM
Replies: 37
Views: 1,377
Posted By jac mac
Re: Calling Old Members

Ian, No, have not heard from Russ or Lim, last time Russ visited here he mentioned he was intending to relocate and sell the 40 and would list it here on forums, dont recall that happening. No...
Forum: The Paddock 19th May 2018, 04:40 AM
Replies: 37
Views: 1,377
Posted By jac mac
Re: Calling Old Members

I still read, dont post as often and in many cases dont respond to general questions when I feel the person asking could find the answer in a quick search, guess I am saying a feel some recent new...
Forum: Site Questions, Suggestions, & Comments 18th May 2018, 05:13 PM
Replies: 36
Views: 1,251
Posted By jac mac
Re: GT40s Forum Upgrade

Absolutely agree Ian, and the list of missing active posters continues to grow. I occasionally view the paddock politic and gun threads, but its not because of an active interest in the topics, but...
Forum: Superformance GT40s 9th May 2018, 03:22 AM
Replies: 6
Views: 495
Posted By jac mac
Re: clutch

John, what is the problem with the clutch, is it slipping?, thought occurred to me that you might have a problem that is external like not enough freeboard etc. If thats the case it can be adjusted...
Forum: GT40 Cars For Sale 8th May 2018, 05:07 AM
Replies: 30
Views: 4,594
Posted By jac mac
Re: FORD GT40 GELSCOE 1969 specs

Alloy Spider that rivets to tub/mono IIRC, chassis appears to be steel in these pics from Gelscoe site, I'm just going by the haz around spot & gas welds.
Forum: Wings, Wheels, and Keels 5th May 2018, 10:24 PM
Replies: 33
Views: 1,861
Posted By jac mac
Re: Gravity Racer, take II

Scrub radius, castor etc, Chris. get rid of the induced drag from front tire contact patch being offset like it is at moment. Put a sheet of newspaper on floor and keep playing with it until it stops...
Forum: The SLC Clubhouse 26th April 2018, 03:36 PM
Replies: 163
Views: 5,648
Posted By jac mac
Re: SLC Hubs/ race worthy

Thanks Howard, pretty obvious in pic 2/post 80 above that your car did a few laps after the fracture started going by the spline wear on outer section during which time the effective bearing pre load...
Forum: The SLC Clubhouse 25th April 2018, 04:09 PM
Replies: 935
Views: 248,658
Posted By jac mac
Re: SLC 24 Howard Jones

Very likely given the bearing looks like it has a smaller radius on inner dia which could become critical load point on that splined shaft part of hub where it enters bearing bore when things start...
Forum: The SLC Clubhouse 24th April 2018, 07:14 PM
Replies: 935
Views: 248,658
Posted By jac mac
Re: SLC 24 Howard Jones

Howard, did the driveshaft actually break where it pass's thru the splined hub or lose the nut off end, do you have pic of it, just trying to work out order of failure here. FWIW we run the same hub...
Forum: The SLC Clubhouse 20th April 2018, 07:48 PM
Replies: 163
Views: 5,648
Posted By jac mac
Re: SLC Hubs/ race worthy

Being in Kiwi Land my options would not be as wide as yours, but really are there any 'factory' options from other vehicles that would stand the forces yours and other combos like it are...
Forum: Wings, Wheels, and Keels 20th April 2018, 12:58 AM
Replies: 620
Views: 114,115
Posted By jac mac
Re: M20 Dreaming

IIRC its not that simple, apparently 2oz might be per sq foot for csm & per yard for weave in USA whereas 225g is per sq meter everywhere else.
Forum: The SLC Clubhouse 19th April 2018, 09:14 PM
Replies: 163
Views: 5,648
Posted By jac mac
Re: SLC Hubs/ race worthy

0.31" is ~5/16" Howard, not 3.
Forum: GT40 Tech - Engines/Induction/Exhaust 14th April 2018, 08:59 PM
Replies: 30
Views: 1,936
Posted By jac mac
Re: Bundle of Snakes Advice

You need to remember 'original' GT40 used small dia flywheel & bellhousing, anything larger compromises that benefit of clearance in horse shoe, also 'original' were mounted off original block...
Forum: GT40 Build Logs 14th April 2018, 05:20 PM
Replies: 340
Views: 131,539
Posted By jac mac
Re: Dean's GT-R build thread

Deans engine is fore sale in 'The Garage Sale' forum ( P2 and labeled 'Coyote Engine), you can read about it and what caused the failure there. Dont ask me why he has not posted on build thread for...
Forum: GT40 Tech - Engines/Induction/Exhaust 13th April 2018, 11:26 PM
Replies: 30
Views: 1,936
Posted By jac mac
Re: Bundle of Snakes Advice

Kims engine is 363 cu in, Those headers appear to be stepped so at a guess with 2" tailpipes it would be 1.75"OD primary size at port. When I built the 346 in the TVR I was told it was going to be...
Forum: GT40 Tech - Engines/Induction/Exhaust 13th April 2018, 08:13 PM
Replies: 30
Views: 1,936
Posted By jac mac
Re: Bundle of Snakes Advice

HUGE difference between the alloy top link of horse shoe on Kim's vs Ricks car.
Forum: Wings, Wheels, and Keels 9th April 2018, 10:28 AM
Replies: 33
Views: 1,861
Posted By jac mac
Re: Gravity Racer, take II

I meant something like this Nick. Your twin wheel deal has similar problem to using very wide drag type rear tire on V8 bikes etc where leaning over in turn 'jacks' up riders effective seat height,...
Forum: Wings, Wheels, and Keels 9th April 2018, 04:42 AM
Replies: 33
Views: 1,861
Posted By jac mac
Re: Gravity Racer, take II

Its a BIG bucket! One of those situations where the line between being clever or very silly can get blurred! Have a mate out here who used to race go karts & was keen to build a frame where he was...
Forum: Wings, Wheels, and Keels 9th April 2018, 02:08 AM
Replies: 33
Views: 1,861
Posted By jac mac
Re: Gravity Racer, take II

Id run two rear wheels in tandem, but that might not fit the 'genuine 4 wheel wording!
Forum: GT40 Tech - Engines/Induction/Exhaust 8th April 2018, 08:38 PM
Replies: 30
Views: 1,936
Posted By jac mac
Re: Bundle of Snakes Advice

Dont see why the trans should be sitting high as porsche trans run input shaft below output driveshafts like ZF. I wonder if the header set you have were actually made for a 351w (1.280" higher deck...
Forum: GT40 Build Logs 6th April 2018, 03:41 AM
Replies: 167
Views: 64,865
Posted By jac mac
Re: Classic Car Developments Chassis #3

Arrows on drawing show what hot ( red ) and cooled (blue ) flow directions will try to do with that EWP setup you have there. To correct this the hose's from 5/8" fittings on T/Stat and bottom of...
Forum: GT40 Tech - Fueling, Electrics, & Engine Cooling 5th April 2018, 09:16 PM
Replies: 14
Views: 712
Posted By jac mac
Re: Faulty oil gauge?

Assuming SBF engine...Sender unit is found just in front of oil filter, or may be at end of short hose if original owner mounted it remotely from that oil gallery fitting. Sender will be about 2"+...
Forum: GT40 Build Logs 4th April 2018, 05:43 PM
Replies: 167
Views: 64,865
Posted By jac mac
Re: Classic Car Developments Chassis #3

When you use an EWP in conjunction with the modded OE pump housing like that you cannot use either of the 5/8" hose fittings on the OE pump housing as they are now under EWP pump flow direction and...
Forum: Superformance GT40s 28th March 2018, 05:52 PM
Replies: 12
Views: 903
Posted By jac mac
Re: Ground Clearance

Original prototype & Mk1 is 4.8", MK3 is 5.25", & MK2 is 3.9". So I guess you use what you choose, 'wisely' from day one.
Forum: Wings, Wheels, and Keels 26th March 2018, 04:37 PM
Replies: 248
Views: 43,061
Posted By jac mac
Re: McCopy mk 5

Try this, about 2.5" thick lengthwise installed in car, added a bit to the drawing to hopefully clarify..
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