UN1 Bellhousings

Neil · 05-19-07, 01:05 PM

I have just had my UN1 up graded, but I am having problems the belhousing. Sorry all you Ford fans but its mated to a Chevy LS1.

I am using a UK manufactured one piece belhousing for the small block Chevy, Are their any alternative manufactures in the market place. Before I start to cutting this one.

Thanks

Scott Calabro · 05-19-07, 02:56 PM

Neil,
Ask Andy at Tornado Sports Cars. He may be able to help you.
Best,
Scott

Ian Anderson · 05-20-07, 06:26 AM

Have you tried Chris cole?

Ian

Frank Catt · 05-20-07, 06:47 AM

Neil, what are your problems ?

Neil · 05-20-07, 07:48 AM

Hi,

The problems related to UN1 to LS1

I was advised on collection that I would need a custom flywheel, this came as a surprise. I have had quotes from £600 to £1300. But this only creates additional problems: what happens to the starter! I would need to fabricate a second mounting for the starter. The cost would be astronomical.

The Chevy LS1 flywheels have the standard 168 teeth. It looks as the clutch cover will also foul but a smaller clutch pack is not unreasonable.

It would help to know if an off the shelve belhousing was avalible. As I do not think there is sufficient material to start machining the belhousing.

Neil

Steve · 06-03-07, 04:04 PM

I am sure chris cole has a chevy to un1 bell housing.

Chris Hale · 06-03-07, 04:59 PM

Hi Neil,

I currently have a Chevy 355 with a bell housing that was supplied to me from Chris Cole but to be honest, when I was researching into a bell housing the Tornado bell housing and Chris Cole’s looked exactly the same to me.

I did not have a massive problem with the flywheel, I used a 153 tooth lightened flywheel that took a 7.25” clutch, this I bought on EBay for around £100 from an Ex Nascar.

What you must be careful is matching it to a starter; I was lucky the guy I bought the flywheel from also had a high torque starter that did not cost me the earth, just make sure the offsets are correct and that it is the right gearing.

I have attached some photo's that may help you, one thing I did do is upgrade my Tilton three plate clutch to a twin plate ceramic clutch as I use the car on the street and I did not take allot for me to warp the floater plates and the ceramic clutchs take alot more heat to damage them, so while I was doing this I also upgraded to a hydraulic release bearing this did involve allot of measuring and It is very tight but it can be done.

Regards,

Chris.

Neil · 06-04-07, 12:17 PM

Chis

Thank for the input. I looked at using the 153 toothed flywheel but because I am using the LS1 it has a bolt pattern /flange diameter on the crank.
The belhousing is identical I must assume they come from the same source. I do like the concentric release bearing is it from AP?
We are currently going to add strengthen webs to the outside of the bell housing then we machine 2.5mm from the inside edge .
What do you use your car for that one serious clutch pack!

BruceLambo · 06-04-07, 07:19 PM

Neil, why dont you use the LS1 bellhousing and make an adapter plate between that and gearbox. That way you can use the LS1 flywheel, clutch and starter etc etc. You may have to make a new input shaft because the other will be shorter, but this is no problem as it resides in a splined sleeve, and you can cut the clutch splines to suit.

Neil · 06-05-07, 05:23 AM

I looked at using a LS1 / Chevy belhousing and an adapter plate. But having spent a great deal of money having the box rebuilt with Quaife internals and LSD. It difficult to change to basic concept of a one piece shaft.
I think we have found the solution in machining the belhousing. I will post photos in the next few weeks.

BruceLambo · 06-07-07, 02:28 AM

Quote:

Originally Posted by NDS

I looked at using a LS1 / Chevy belhousing and an adapter plate. But having spent a great deal of money having the box rebuilt with Quaife internals and LSD. It difficult to change to basic concept of a one piece shaft.
I think we have found the solution in machining the belhousing. I will post photos in the next few weeks.

I made myself a 1-peice input shaft too, all you do is make the adapter plate between the bellhousing and 'box to a suitable width to fit. But thinking about it now, the 'English-made' 1-peice shafts are the same length as the standard Renault so my idea wont work for you. My shaft is about 2 inches longer.