Engine and Transmission Tech

I talked to a local machine shop about it today and he said he does it with a CNC machine. Cost is somewhere around $150. Seems pretty straight forward. I should look at other options though. Oh, we are talking about the flywheel, not the crank flange...I'm sure you meant flywheel Carl.

The Novak Guide to
Clutches, Linkages & Bellhousings for Jeep® Conversions

[www.novak-adapt.com]

Yeah, I meant redrilling the flywheel to match the crank pattern. Not sure I could be comfortable abusing that flywheel.

There is a crank spacer on some LSx that may be of use, as well.

The Fiero guys plug and drill all the time with no problems. Interference fit steel plugs between the LS pattern. LS pattern is Metric equal to 3.110" circle. Do a tracing of your crank flange to verify. You could use the LS flywheel cut down for S10 ring gear with S10 pressure plate pattern drilled,probably cost about the same. Or for $300 you could call LSC for a custom billet; LS crank pattern/S10 diameter for 148 tooth ring gear(you would need a S10 flexplate for ring gear). The spacer Carl is refering to is used in early LSX(Late90's)that have automatics. It would be useful if you used the Speedway Motors adapter and full size Chevy bellhousing(same pattern except one bolt). I like the smaller bellhousing idea better myself though. Scott, remember you will need a HD pressure plate and clutch also, with over twice the power of the little V6.



Edited 3 time(s). Last edit at 03/18/2013 05:23PM by mgb260.

The auto box is sounding better all the time.....

Don't think so, not in my MG! :)



Edited 1 time(s). Last edit at 03/19/2013 07:44PM by MGBV8.

Auto box, forsooth!

Quote:

I talked to a local machine shop about it today and he said he does it with a CNC machine...

So he's done this before? That's encouraging. If I'm reading you right, Scott, you're thinking of re-drilling the flywheel without plugging its original hole pattern. Is that feasible? I'm out of my depth, but one thing I'm pretty sure of is that my local machinist could place the holes accurately. I wouldn't expect him to know finer points of balancing, etc.

A custom billet flywheel for $300 sure sounds like a tempting proposition... How does that compare to your local machine shop's charge and what would the weight difference between the resulting flywheels be? A really lightweight flywheel contributes a lot to the sports car driving experience. You want this thing to rev freely like a chainsaw or a dirt bike, right? "Brap-bap-pa! Brap-bap-pa!"

I'm with Curtis, sounds like money well spent & possibly much safer.

Quote:

A custom billet flywheel for $300 sure sounds like a tempting proposition

Sign me up for that! Where can one find a custom flywheel for that kind of money? Frankly, I'd be happy with a duplicate of the S10 flywheel with the LS flange pattern. I wonder if a blank can be obtained? I'll investigate this and the custom flywheel as well. Thanks for adding to the conversation Curtis!

Didn't answer your question Curtis. Yes, the local shop has done it before. He said he usually doesn't plug the flywheel. I'm not sure it would work in this case. I have lots of research to do.....part of the fun in doing something like this.

Scott, Call Tom at LSC flywheels at 1-951-245-6367 and see if you can send him a 88-92 S10 flexplate and LS crank specs. The phone number is old,so if it does'nt work. Email him off the LSC web page. [www.lscperformance.com]

Here are old pictures of a 4.9 plugged and drilled and LSC billet flywheel.





Edited 2 time(s). Last edit at 03/22/2013 09:38PM by mgb260.

Looks great, Jim!

Great information Jim!! Thank you!

I talked to Tom at LSC today and he will make a flywheel for me. It will be "custom" so a little more than those he has done before. He wants me to send a sample S10 flywheel to use as a guide. It will be billet steel. I'll try to get it ordered in May. Getting there bit by bit. :)

Looking forward to an update. My fav thread has taken a nap. ;)

From my perspective there isn't much of anything to update. I just got back from vacation and getting my car ready for Omaha is behind schedule, which is surprising. :)

There isn't any lack of excitement to progress on the LS4, just a lack of time until after the meet. I have been refining my planning going forward. One thing I'm going to do is visit the junkyard at some point, find a 2.2 S-10 and actually measure the clutch mounting surface of the flywheel to the bellhousing mounting surface of the block. If I'm going to have a flywheel made I want to make sure that measurement is correct for the S-10 bellhousing that will be used. I'm also in the middle of researching options available for fuel injection among other things.

As things happen I'll update the thread if there is interest.

Regards

Scott

Oh, I think there is interest.
You probably have a bit of leeway on that flywheel face measurement, however much adjustability there is in the HTOB.

Jim

Scott if you can pull this off without a huge amount of jiggery pokery you can be sure that lots of other guys will replicate your work. Consider your project as the beta project!! If I ever do another engine swap project I will consider going with the LS4 if this thing works out. I can see it now a TR4 with an LS4.

Cheers
Byron

A question recently came up about motor mount bosses on the LS4. They appear to be different than an LS1 block but there shouldn't be any issues using what is there. Here is a picture of both sides of the block. Top picture is of the left side of the block, bottom of the right side.

Regards

Scott

I will take photos of my ls1 and post up soon to see if there is a difference

. There are some differences, but if you get the plates they make you can bokt up either one I believe.Top photo isdriver side. Bottom photo passenger side. Looks like dip stick hole is different too (right behind the starter). In my photo it is taken out on the passenger side.

Sorry for the sideways photos. My camera in my phone does this because of the pixels count.







Edited 1 time(s). Last edit at 06/20/2013 01:56PM by 74ls1tr6.