15 lbs flywheel...
Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,709
Likes: 25
From: Sorrento Italy
15 lbs flywheel...
just got my new alu 15 lbs hayes flywheel...
it came with 6 grade 8 bolts and that's all...should i need to replace anything else once i've already take the trans apart?
it came with 6 grade 8 bolts and that's all...should i need to replace anything else once i've already take the trans apart?
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
My Aluminum flywheel did not even come with bolts. I did not replace anything else with it. Just cleaned all the bolts and my clutch a PP were new last year so I was good to go. Cleaned everything up reinstalled and torqued every up and it is ready go. I have not fired it up yet but can't wait to see what it does compared to my 30 pounder.
Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,709
Likes: 25
From: Sorrento Italy
My Aluminum flywheel did not even come with bolts. I did not replace anything else with it. Just cleaned all the bolts and my clutch a PP were new last year so I was good to go. Cleaned everything up reinstalled and torqued every up and it is ready go. I have not fired it up yet but can't wait to see what it does compared to my 30 pounder.
do the bolts need a special torque figure when reinstalled?
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Yes the flywheel to crank should be 60 ft lbs and the pressure plate bolts should be at 35 ft lbs. I use blue Loctite on the threads for an extra measure of security.
Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,709
Likes: 25
From: Sorrento Italy
Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,709
Likes: 25
From: Sorrento Italy
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Mine is 22 pounds. I think that my fellow racing buddy has a 40 lbs with 11 inch clutch. One of the major differences I've noted between our cars is the ability of my motors changing rpm very quickly.
His car under heavy braking and turning in to hit a good apex on a corner. You have to be very careful on down shifting to rpm match. Or else the added motor crompression braking will really kicks the back end out.
I have light weight everything in and on the outside of the motor. so it doesn't have the tendancy to lock the rear tires on a down shift.
His car under heavy braking and turning in to hit a good apex on a corner. You have to be very careful on down shifting to rpm match. Or else the added motor crompression braking will really kicks the back end out.
I have light weight everything in and on the outside of the motor. so it doesn't have the tendancy to lock the rear tires on a down shift.
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Team Owner
Joined: Apr 1999
Posts: 21,953
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
If I sold my 700R4 the switch would be worth it.
Le Mans Master
Joined: Oct 2005
Posts: 9,429
Likes: 44
From: Macon, GA
Glad I came across this thread. I'm on Summits website now trying to pick out a flywheel for my 327. I'm going to pick it up tomorrow so i have to pick one out tonight. 
Is there a huge benefit with a 15.5 lb unit?
Also, do I need 153 or 168 tooth count?
I was looking at these:
http://store.summitracing.com/partde...0&autoview=sku
http://store.summitracing.com/partde...5&autoview=sku
.
.
.
.
.
Is there a huge benefit with a 15.5 lb unit?
Also, do I need 153 or 168 tooth count?
I was looking at these:
http://store.summitracing.com/partde...0&autoview=sku
http://store.summitracing.com/partde...5&autoview=sku
.
.
.
.
.
Last edited by sperkins; Jan 26, 2007 at 11:43 PM.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Glad I came across this thread. I'm on Summits website now trying to pick out a flywheel for my 327. I'm going to pick it up tomorrow so i have to pick one out tonight.
Is there a huge benefit with a 15.5 lb unit?
Also, do I need 153 or 168 tooth count?
I was looking at these:
http://store.summitracing.com/partde...0&autoview=sku
http://store.summitracing.com/partde...5&autoview=sku
.
.
.
.
Is there a huge benefit with a 15.5 lb unit?
Also, do I need 153 or 168 tooth count?
I was looking at these:
http://store.summitracing.com/partde...0&autoview=sku
http://store.summitracing.com/partde...5&autoview=sku
.
.
.
.
Le Mans Master
Joined: Oct 2005
Posts: 9,429
Likes: 44
From: Macon, GA
Thanks man. That's good advice. What do you think abut this one instead?
http://store.summitracing.com/partde...1&autoview=sku
http://store.summitracing.com/partde...1&autoview=sku
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
You'll have to decide for yourself on that one. What you want the car to do, get the RPM really quick or pull from zero like a freight train.
I like the light flywheel on mine, but the torque the BB has anyway offsets the low inertia to a point. A heavy flywheel on my combination and I have to shut it off and let the clutch out at the same time to get it to stop turning. Been there. I tried a light one on a Z-28 I had and didn't really like the result, but that's my opinion.
Someone else may jump in with some more direct experience..
I like the light flywheel on mine, but the torque the BB has anyway offsets the low inertia to a point. A heavy flywheel on my combination and I have to shut it off and let the clutch out at the same time to get it to stop turning. Been there. I tried a light one on a Z-28 I had and didn't really like the result, but that's my opinion.
Someone else may jump in with some more direct experience..
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
I just put a 12.5 pound Fidenza flywheel on mine. Iwent from a 30 pounder to the 12.5 one. It will be a month or two before I have results but I have a good amount of torque so I'm not worried about the low end. I just want it to rev faster.
Racer
Joined: Dec 2006
Posts: 417
Likes: 40
From: Swansea IL
Lt Flywheesl
Wow, a 15 lb flywheel on a 302 Z-28. I'll bet that was fun to drive! My 69 Z28 wouldn't pull a fat girl off a tricycle as far as low end torque was concerned. Launching it from a dead stop was a chore as well. As soon as the tires hooked, the engine bogged and you played catch up all the way. I had a 2.2 Muncy and 4:10 final drive.
Only way around that was more gear in the rear end.
Lt. Flywheels are probably a good thing on BB engines for the street. Probably the big inch SBs too. You trade off excessive tire spin (starting from a dead stop) for faster engine acceleration. Often you may need more rear gear to make a happy meduim. You will definately launch from higher RPM to get things moving.
A rev limiter might not be a bad idea as if you should miss a shift, the engine RPM will certainly go much higher before you can catch it. Dropped valves and such are pretty nasty.
Just a thought on that one.
Bob
Only way around that was more gear in the rear end.
Lt. Flywheels are probably a good thing on BB engines for the street. Probably the big inch SBs too. You trade off excessive tire spin (starting from a dead stop) for faster engine acceleration. Often you may need more rear gear to make a happy meduim. You will definately launch from higher RPM to get things moving.
A rev limiter might not be a bad idea as if you should miss a shift, the engine RPM will certainly go much higher before you can catch it. Dropped valves and such are pretty nasty.
Just a thought on that one.
Bob
Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,709
Likes: 25
From: Sorrento Italy
i have a 530tq figure, hope it's enough to use it without having to rev the engine until 6.000 rpms for a decent start...
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Wow, a 15 lb flywheel on a 302 Z-28. I'll bet that was fun to drive! My 69 Z28 wouldn't pull a fat girl off a tricycle as far as low end torque was concerned. Launching it from a dead stop was a chore as well. As soon as the tires hooked, the engine bogged and you played catch up all the way. I had a 2.2 Muncy and 4:10 final drive.
Only way around that was more gear in the rear end.
Lt. Flywheels are probably a good thing on BB engines for the street. Probably the big inch SBs too. You trade off excessive tire spin (starting from a dead stop) for faster engine acceleration. Often you may need more rear gear to make a happy meduim. You will definately launch from higher RPM to get things moving.
A rev limiter might not be a bad idea as if you should miss a shift, the engine RPM will certainly go much higher before you can catch it. Dropped valves and such are pretty nasty.
Just a thought on that one.
Bob
Only way around that was more gear in the rear end.
Lt. Flywheels are probably a good thing on BB engines for the street. Probably the big inch SBs too. You trade off excessive tire spin (starting from a dead stop) for faster engine acceleration. Often you may need more rear gear to make a happy meduim. You will definately launch from higher RPM to get things moving.
A rev limiter might not be a bad idea as if you should miss a shift, the engine RPM will certainly go much higher before you can catch it. Dropped valves and such are pretty nasty.
Just a thought on that one.
Bob
And on the BB, the rev limiter is a necessity- I've had the clutch stick to the floor at 8000. Installed a scattershield right after that- AND the rev limiter.