Port and Polish.

[Paul W]

Hey guys, I've got a 1971 sbf 302 in my 40 and wanted to get more performance. I was recommended to port and polish the intake and exhaust. We found out they used abrasive material to do it like gritty sand. So I got with my friend that tunes Hondas and we decided to try it ourselves. We got a bag of sandblasting sand and hooked up into the intake and started the car - we had to hold the gas so it would run. He wanted to let the engine suck in the sand through the intake so it would port it out and then push it out the ehxaust so it would port the exhaust manifold.
I was worried that it might cause problems but he figured it'd be OK. After running the car and letting it suck in sand we got about half way through a 25 lb bag. The engine was bucking and kicking and sounding really weird. We stopped and hooked the car back up normal and took off the sand supply. We tried to start it again and it was really hard. Once started it couldn't idle and kept making weird noises. We took it out and drove it and it started to make scraping and knocking noises.
Help! Can anyone tell me what to do! My buddy only does Hondas so he doesn't know much about Fords.

 

[Jac Mac]

Surely its not April 1st already, even in jolly old England.

 

[David Lowe]

The scary thing is he might be telling the truth.

 

[Steve26]

I have to assume that you are joking but if you're not I'll say what everyone here is thinking. You must be the most stupid person on the planet!:shocked:

Steve

 

[Ian K]

Paul,

I really really really hope you are kidding.







Really.

Ian

 

[Doug S.]

ROTFLMAO, Paul!

Thanks for the grin.

Those of us who are oldies will remember the Extrude-hone process, whereby a putty like abraisave solution was forced through manifold runners, etc., in an effort to accomplish exactly what you present here.

Good one!

Doug

 

[Ian K]

ROTFLMAO, Paul!

Thanks for the grin.

Those of us who are oldies will remember the Extrude-hone process, whereby a putty like abraisave solution was forced through manifold runners, etc., in an effort to accomplish exactly what you present here.

Good one!

Doug

Yeah, but not one a running engine

Ian

 

[David Morton]

Paul, there is a better way - Walnut shells or Pecan Nut shells.
I jest you not. It really provides for a performance recovery
and highly recommended Walnut Shell and Pecan Shell Filter Media, Abrasives, and Carriers - Industry Approval Letters)
If you are having problems with the porting and build up of sand around the valve guides, try Witco. You can hose it in using a garden spray on fine mist no worries at all, and all that residual sand will dislodge.
As for the strange noises, just run it at the red line for about 10 to 15 seconds every minute about ten times. The Witco will finish it off for you.

 

[Ron Earp]

Those of us who are oldies will remember the Extrude-hone process, whereby a putty like abraisave solution was forced through manifold runners

That's old?

Sheet.

 

[Cliff Beer]

Paul, you can fix the scraping and knocking noises by utilizing a similar sand-based process: use the remaining 12.5lbs as an oil additive. Best way to do it is run the engine up to redline and then slowly feed the sand into the oil filler being carefull not to bog the engine down by putting all of it in at once. Keep your foot down and don't worry about the rising coolant temp readings and foul smell of burned oil. She'll be purring like a kitten in no time.

 

[Jac Mac]

That's old?

Sheet.

Made headlines about the same time as the 260z nissan was introduced. IIRC

 

[Frank Catt]

I read somewhere that water injection helps with engine performance, so a 1/2 inch garden hose was connected to the holley, turned on before cranking the engine over. For some reason there was a massive bang as the engine stopped spinning very abruptly, and now the pistons dont seem to go up and down very well ! Any ideas ?

 

[Ron Earp]

Made headlines about the same time as the 260z nissan was introduced. IIRC

Whew, what is good to know. For just a second there I thought I was getting a bit dated! :jester:

 

[Jon Briggs]

Paul,
Thats an old one, but still very funny though!

 

[David Morton]

Frank - you live in a hard water area. You are supposed to use soft water or demineralised !! If you can spin the engine backwards by reversing the battery all the hard water will be thrown out of the holley and your problem is cured.

 

[Frank Catt]

Damn, I knew it was something simple like that, I will try some Highland Spring from Tescos !

 

[Frank Catt]

The first guy who tried to build a reciprocating engine was a German in 1600 something. He did not have any idea of liquid fuels so he used gunpowder, which was OK for the initial start, but he had a problems keeping it running, he couldnt recharge the cylinder quick enough ! ( Burnt his fingers ! )

 

[David Morton]

Fine - much better than that Evian stuff but remember to redline the engine as the water is added. You will find that valve bounce becomes a thing of the past.

 

[Jac Mac]

Whew, what is good to know. For just a second there I thought I was getting a bit dated! :jester:

There are a lot of guys on this forum who are a bit dated, but that wouldnt stop them from going on a date if they thought they might get a bit,but then they might get a bit more than they wanted when they arrive home at a later date! :jester: :jester:

 

[John Oxborough]

Hi Dave

Hope you are not trying to mimic car no 11 Le Mans 1968 (Chassis 1076)? Brian Muir spent 3 hours digging and shovelling sand around his GT40 but only succeeded in ruining the clutch and shortening his career at JW Automotive!

John