LS4

[mgb260]

Carl, the crank is actually longer than the 2.2 by a little less than 1/8" inch. It is shorter than the other LS motors by 3mm in back(the other LS is .400 shorter than the old SBC) and 10mm in front. Jim B, I think its angle or perspective in that picture,also there is a relief for the stock LS4 starter mount. Probably have to fab  a sheet metal dust shield on bottom. I don't know if the 148 tooth flywheel will fit in the 2.2 bellhousing or not. The S10 bellhousing has the Chevy pattern for the T5(the one for Carl!). The 84-86 Jeep Cherokee 2.8 V6 and 2.5 four bellhousings have the Ford pattern. Both have passenger side starters. Scott already has the 2.2 bellhousing with driver side starter on his V6.

[Scott Costanzo]

I shouldn't be disassembling my car any further than it is already but I had to take a look at my 2.2 S10 bellhousing to flywheel clearance. I was pleasantly surprised by what I found.



Looks like the 148 tooth flywheel should fit after all. It will really simplify things for me.

I need to do some research and call some local companies but can anyone suggest an automotive machine shop in the mid-west that does flywheel redrilling on a regular basis?

Regards

-- Scott

[BlownMGB-V8]

Why are you redrilling? Doesn't that flywheel Carl found work?

Jim

[Scott Costanzo]

No, the the V6 crank flange is different.

[Scott Costanzo]

I just remembered I had these...they aren't confirmed #s

2.8 Flywheel bolt pattern
Center hole - 1.5"
Bolt center to center - 2.375"

5.3 Flywheel bolt pattern
Center hole - 2.085"
Bolt center to center - 3.125"

[Moderator]

Gentlemen,

If you're downloading photos from someone else's website and then uploading them to BritishV8, you're probably breaking the law.

If I notice these violations, I have to delete the photos. I can't leave them on the BritishV8 server. I'm not prepared to defend BritishV8 from lawsuits.

PLEASE stop and think before you post other people's photos here! If the photographer hasn't given you personal permission, don't post.

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-Curtis

[BlownMGB-V8]

Thanks Curtis.
We should be able to do just as well by posting a link to the photo if it is on another site. That way there is no trademark issue.

Jim

[mgb260]

Probably me, I posted a few thumbnails that were from EBay or autoparts stores and didn't see the copyright or water mark. Not intentional. I'll be more careful, link and description.

[MGBV8]

The LS engines are not externally balanced.
Much of this confusion is caused by:
1.Chevy zero balances the flywheel and pressure plates as a unit so the flywheel alone may not be zero balanced
2.Chevy refines the balance of Vette engines after they are assembled by pressing small weights into pre-drilled holes in the flywheel & damper as determined by spinning the engine as an assembly
3.Chevy did not refine the balance of Camaros so they will not have the small weights
4.New replacement dampers are zero balanced
5.Used dampers from a Vette may not be zero balanced if they still have the weights installed
6.Aftermarket flywheels are zero balanced
7.Aftermarket pressure plates are zero balanced

So here are a few chooses when modifying your engine
1.To change only the flywheel or only the pressure plate, match balance to the old value
2.To change the flywheel & pressure plate together:
•match balance an aftermarket flywheel/pressure plate as a unit
•when using a new Chevy flywheel/pressure plate, you can transfer the small weights or match balance

Other options include going back to a zero balance damper & flywheel/clutch by removing all of the weight or zero balancing everything, which is as good as a Camaro balance

[MGBV8]

No, the the V6 crank flange is different.

I just remembered I had these...they aren't confirmed #s

2.8 Flywheel bolt pattern
Center hole - 1.5"
Bolt center to center - 2.375"

5.3 Flywheel bolt pattern
Center hole - 2.085"
Bolt center to center - 3.125"

I did not realize this. I thought you were speaking of redrilling for different a clutch pattern.  I'm not so sure redilling the crank flange is a safe thing to do. That is, even if you can find someone that can accurately place the exact size holes properly indexed to the crank centerline.  Maybe so, they do it for clutches, but we are talking about removing more material from a critical area. Forget a stock bellhousing. Time for a steel blow-proof Lakewood.

Milling down a LS1 flywheel to fit the 148 ring gear may be the way to go.

[Scott Costanzo]

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.

[MGBV8]

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

http://www.novak-adapt.com/knowledge/clutches_etc.htm

[MGBV8]

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.

[mgb260]

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.

[Dan B]

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

[MGBV8]

Don't think so, not in my MG!  

[Moderator]

Auto box, forsooth!

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!"

[MGBV8]

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

[Scott Costanzo]

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!

[Scott Costanzo]

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.

[mgb260]

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.    http://www.lscperformance.com/

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

[MGBV8]

Looks great, Jim!

[Scott Costanzo]

Great information Jim!! Thank you!

[Scott Costanzo]

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.

[MGBV8]

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