Mopar 8 3/4 question - Page 2

GeneWilsey · 11-30-2013, 09:02 PM

Thanks for the kind words and good ideas. It has been a lot of trial and error. What works on some cars just seems not to work on all.
I am not sure who makes the aluminum spool other than Mark Williams. We do not have one of his spools in the car now so we would have to buy both.
We did switch to a solid roller from the Shubecks and solid cam we started with.
A lighter driveshaft might be in the plan also.

Has anyone seen a decent gain from reducing the rotating weight in the drivetrain ?
Jeff I did send you an email.

Thanks Again

Ed Wright · 11-30-2013, 09:49 PM

Quote:

Originally Posted by GeneWilsey

Thanks for the kind words and good ideas. It has been a lot of trial and error. What works on some cars just seems not to work on all.
I am not sure who makes the aluminum spool other than Mark Williams. We do not have one of his spools in the car now so we would have to buy both.
We did switch to a solid roller from the Shubecks and solid cam we started with.
A lighter driveshaft might be in the plan also.

Has anyone seen a decent gain from reducing the rotating weight in the drivetrain ?
Jeff I did send you an email.

Thanks Again

About no gains here. Sounds good, but nothing on the time slips. Maybe something there for a low hp car. Larger the diameter the bigger the gains. Inertia is a b*tch.
Those steel wheels are a place you could notice something.

I cleaned the splines out of the right side of an aluminium spool on the staring line at Memphis once. It was no faster than my lightened steel Strange spool. 5 lbs lighter.
My MT slicks are 4 hundredths quicker than my same size Goodyears. Both dead hook. MTs are 5 lbs each lighter, but on a 31" circle, not a 9" circle. I have seen no gains from aluminium drive shafts either. 3" diameter. You think together they just HAVE to be worth something, even though we can't often prove it.

Light wheels (15" diameter ) would likely be worth a hundredth or two over steel wheels.

GeneWilsey · 12-02-2013, 07:12 AM

Thanks for the reply Ed. Due to the class rules the only wheel choices are the ones we have or the rallye wheels. They did not have an aluminum wheel option in 1971.

We were hoping for some return on a rather large investment. How about some of the trick coatings or treatments that are applied to the ring gears and bearings ? It sure does sound like all together we would realize some gain. If we end up doing it, we were thinking of doing the switch at the track for a real comparison.

Thanks
Gene

Mike Taylor 3601 · 12-02-2013, 03:03 PM

Can't give you exact A-B comparision but so far I'm not convinced, my theory is axles,spool,gears won't make as much difference as parts of bigger diameter such as tire. I believe smaller diameter less difference it will make.

If you are'nt making any other changes maybe you can tell us on here for sure. LOL

I like the car, how much does it spin? picture looks like tire is hooked pretty good are they regular old compound,or are they a some kind of soft compund,thinner sidewall version?
I will check out website,but will ask where do they race at?

Mike Taylor 3601

GeneWilsey · 12-02-2013, 07:10 PM

The launch is barely above idle and you roll into it. How fast you roll into it depends on how well the track hooks. For us MIR has the best hook all season hence the best 60"s and best ET's.
The tires are reproductions purchased from Kelsey tire. No real tricks but a little prep goes a long way.

We have raced at various tracks including Lebanon Valley, MIR, Cecil, US 131, National Trail , Virginia Motorsports Park, Englishtown and Beaver Sprimgs. Not every track each year but we do travel.

George Mirza · 12-02-2013, 08:31 PM

Nice car!
The changes you want to make may not make the car quicker, but it shouldn't slow it down either. If you have a minimum weight you could take the weight saved from the drive train and put it somewhere to help the car hook better.
I read about this class somewhere, very impressive cars, look completely showroom stock and run some unbelievable times on stock tires.

Glenn Hayes · 12-02-2013, 10:16 PM

Quote:

Originally Posted by GeneWilsey

we are trying to take 150 pounds out of the car for next year.

This in itself will pick the car up.

What I would suggest is taking advantage of this and move weight to areas that will allow you to full throttle the car off the line.
Are you allowed to use a ignition system that would allow you to alter the ignition curve in an attempt to calm the power slightly on the hole-shot in a effort to get the car to leave quicker?

Wade_Owens · 12-06-2013, 01:19 PM

I have the lightest stuff made in my car, and some of those items may be massaged a bit

I believe that 1 of those items alone may not be worth much or "anything", but what's ten of them worth. You have to be tenascious and cut, grind, shorten, drill or lighten anything that turns. Email me if you want at wadeowens2007@yahoo.com

BES built an engine for a red 71ish Mustang that ran into the 9's in a similar class. Those cars are unbelievable!

Wade

11-30-2013, 09:02 PM	#11
GeneWilsey Junior Member Join Date: Dec 2010 Location: Watervliet NY Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	Re: Mopar 8 3/4 question Thanks for the kind words and good ideas. It has been a lot of trial and error. What works on some cars just seems not to work on all. I am not sure who makes the aluminum spool other than Mark Williams. We do not have one of his spools in the car now so we would have to buy both. We did switch to a solid roller from the Shubecks and solid cam we started with. A lighter driveshaft might be in the plan also. Has anyone seen a decent gain from reducing the rotating weight in the drivetrain ? Jeff I did send you an email. Thanks Again

12-02-2013, 07:12 AM	#13
GeneWilsey Junior Member Join Date: Dec 2010 Location: Watervliet NY Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	Re: Mopar 8 3/4 question Thanks for the reply Ed. Due to the class rules the only wheel choices are the ones we have or the rallye wheels. They did not have an aluminum wheel option in 1971. We were hoping for some return on a rather large investment. How about some of the trick coatings or treatments that are applied to the ring gears and bearings ? It sure does sound like all together we would realize some gain. If we end up doing it, we were thinking of doing the switch at the track for a real comparison. Thanks Gene Attached Thumbnails

12-02-2013, 03:03 PM	#14
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,371 Likes: 352 Liked 304 Times in 102 Posts	Re: Mopar 8 3/4 question Can't give you exact A-B comparision but so far I'm not convinced, my theory is axles,spool,gears won't make as much difference as parts of bigger diameter such as tire. I believe smaller diameter less difference it will make. If you are'nt making any other changes maybe you can tell us on here for sure. LOL I like the car, how much does it spin? picture looks like tire is hooked pretty good are they regular old compound,or are they a some kind of soft compund,thinner sidewall version? I will check out website,but will ask where do they race at? Mike Taylor 3601 Last edited by Mike Taylor 3601; 12-02-2013 at 03:03 PM. Reason: spell

12-02-2013, 07:10 PM	#15
GeneWilsey Junior Member Join Date: Dec 2010 Location: Watervliet NY Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	Re: Mopar 8 3/4 question The launch is barely above idle and you roll into it. How fast you roll into it depends on how well the track hooks. For us MIR has the best hook all season hence the best 60"s and best ET's. The tires are reproductions purchased from Kelsey tire. No real tricks but a little prep goes a long way. We have raced at various tracks including Lebanon Valley, MIR, Cecil, US 131, National Trail , Virginia Motorsports Park, Englishtown and Beaver Sprimgs. Not every track each year but we do travel.

12-02-2013, 08:31 PM	#16
George Mirza Senior Member Join Date: Jan 2002 Location: North Attleborough Ma. Posts: 522 Likes: 0 Liked 0 Times in 0 Posts	Re: Mopar 8 3/4 question Nice car! The changes you want to make may not make the car quicker, but it shouldn't slow it down either. If you have a minimum weight you could take the weight saved from the drive train and put it somewhere to help the car hook better. I read about this class somewhere, very impressive cars, look completely showroom stock and run some unbelievable times on stock tires.

12-06-2013, 01:19 PM	#18
Wade_Owens Senior Member Join Date: Jul 2007 Posts: 578 Likes: 0 Liked 3 Times in 1 Post	Re: Mopar 8 3/4 question I have the lightest stuff made in my car, and some of those items may be massaged a bit I believe that 1 of those items alone may not be worth much or "anything", but what's ten of them worth. You have to be tenascious and cut, grind, shorten, drill or lighten anything that turns. Email me if you want at wadeowens2007@yahoo.com BES built an engine for a red 71ish Mustang that ran into the 9's in a similar class. Those cars are unbelievable! Wade