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-   -   Powerglide and cam combo (Street-strip) (http://www.hotrodders.com/forum/powerglide-cam-combo-street-strip-226853.html)

Coolrider 12-05-2012 09:48 AM

Powerglide and cam combo (Street-strip)
 
Hi! And... excuses my poor english speaking usually in french so...

I'm looking to build a 383 with the biggest torque gain having a powerglide (with TCI kit and 2500 stall) that i wanna keep. I did a lot of searches on the forums and... Oh!!! Not easy to be fixed. I stopped it at the following cam:

Howards 110885-10
Basic Operating RPM Range: 2,000-5,800
Duration at 050 inch Lift: 225 int./225 exh
Advertised Duration: 278 int./278 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.525 int./0.525 exh.
Lobe Separation (degrees): 110 (Not less, having power brake)

My rear end ratio: 3.73 and my intention is to get strong acceleration. Also, i like choppy idle and have tought about this one: Howards Cams Retrofit Hydraulic Roller Camshafts 110525-10 - SummitRacing.com

I plan to get the 75cc AFR 195 (It should give a 9.5:1) I have the Brodix HP1intake (0-6000 range and would be good for torque?)

So, what cam and carb suggested?

Thanks a lot!!!

Harold.

1Gary 12-05-2012 11:06 AM

Yepper.I think builds could start from the rear end forward to have a matched build.You kind of stuck between a rock and a hard place having a limited RPM engine and a two speed trans and the 3.73'srear end gears.Honestly when I saw you using a glide I almost suggested a brake for it,but what's the point when your engine can't spin up to make use of it.

Coolrider 12-05-2012 12:23 PM

It will be with flat top pistons and near zero deck. Honnestly, the compression ratio calculator says around 9.4:1. That's what i'm looking for something like a race track setup and great torques for acceleration.

vinniekq2 12-05-2012 12:32 PM

street/strip and power glide?what car?

I converted my 67 Camaro back in the day. It had a solid roller cam,5.57 gears. It could not be driven on the highway at all.It had a top speed of 115 mph.
I also used a 5,000 rpm stall.
before that it had 5.13 gears and a 4 speed.
that was in the late 70s.
With todays technology you can go faster and have a smother idle. I would use an O/drive auto and maybe as high as 4.30 gears depending on engine and car weight

techinspector1 12-05-2012 02:28 PM

Quote:

Originally Posted by Coolrider (Post 1619358)
My rear end ratio: 3.73 and my intention is to get strong acceleration. Also, i like choppy idle

You are lacking knowledge of launch ratios. If you multiply the rear gear ratio times the first gear ratio, that gives you your launch ratio. Ideally, around 10:1 works best. In other words, your 3.73:1 rear ratio times a first gear ratio of around 2.7:1 would equal 10.07:1. Your PG trans will have a first gear ratio of 1.76:1 if it's a stock first gear, so one or the other needs to be changed in order to afford you optimal launch acceleration. Either use a different transmission that has a first gear ratio around 2.7:1 or change the rear end ratio to something in the 5.57:1 range (12-bolt) for a 9.80:1 first gear final drive ratio. Your current final drive first gear ratio with the PG and 3.73:1 rear gear will be 6.56:1 and you will be very disappointed.

As far as a lumpy cam, install a CompCams Mutha Thumpr. It'll work with your 9.5:1 static compression ratio.

1Gary 12-05-2012 02:35 PM

If you do make a move to a 700R4 get a V8 one from the early 90's.The V8's have better clutches in them than the V6's.The one down fall of the 700R4's is the first to second shift where second is that much lower(numerically lower)you see a drop in RPM.I read somewhere a fix for that where you can get a closer ratio second.

Coolrider 12-05-2012 11:36 PM

I own a 67 Beaumont that you can see, i think, with a clic on my coolrider nickname.

Coolrider 12-05-2012 11:45 PM

I know! My mecanic friend says the same good things about the 700r4 so... I wanted to keep my fact. powerglide but... It seems that i won't have choice to set with that transmission i think. He's a transmission specialist with great knowledge in race track setup and wants to build one for me.

Coolrider 12-06-2012 12:00 AM

That's clear enough. Go to a 700r4. Too heavy and not strong enough for a PG.
3,300 pounds with 275R15.

Thanks to everybody for your help.

1Gary 12-06-2012 12:24 AM

Quote:

Originally Posted by hcompton (Post 1619476)
Dont buy a used trans. Get a rebuilt one like one this guy sells.

Level 1 Rebuilt 700R4 4L60 Transmission 2WD or 4x4 | eBay

Its a good deal for a great trans he will also work with you to get it installed right with the correct linkage and lockup options.

He can do the close ratio upgrade but its not needed. The low first gear is great pulls you out the whole and second is your power gear. Usally works great with torque build. It is also only a little off not a major change like granny gear truck trans.

Also will let you run 1500 rpm on the highway. Really helps on fuel and noise on the road. Also makes your engine last a little longer if you need to drive it on the highway for any length of time.

I honestly was thinking more in the vein of him building his own.There are a number of guys that have gone the route of Trans-Go shift kit,Vett servo,5 boost valve.The thing is it doesn't address the sun gear.The failure there is either the splines gets stripped or the weld breaks.

http://i172.photobucket.com/albums/w...ell2Custom.jpg

Yrs ago TCI impressed me.They are a very progressive class company.First check we received as contingency money was from them.All the rebuild parts address the issues that 700R4's have.From their monster sun gear to a number of stages in their valve bodies.They developed a valve body that eliminates the critical TV cable adjustment.So either for a you build or to buy of their trannies,it is a nationally known company with a excellent customer service department.

But we need to let the O/P post to see what direction he wants to go.

Coolrider 12-06-2012 03:24 PM

Thank you for your advice. I am going to speak about it to my friend mechanic. You helps me in my plan and, also, thanks a lot to techinspector1. I chose the 283THR7 Tumpr cam. So... with that setup, i should be satisfied. Thanks once again to all of you with your great knowledge.

Harold.

cobalt327 12-10-2012 01:51 AM

Quote:

Originally Posted by Coolrider (Post 1619691)
I know! My mecanic friend says the same good things about the 700r4 so... I wanted to keep my fact. powerglide but... It seems that i won't have choice to set with that transmission i think. He's a transmission specialist with great knowledge in race track setup and wants to build one for me.

The PG is not good for acceleration in a heavier car, but the top speed is not affected one way or the other- it has a 1:1 ratio in Drive, same as a TH350/TH400, etc. So the top end speed is going to be the same, or maybe a little higher due to less frictional losses.

Where you can have the better of both worlds is to use a TH2004R or TH700R4 like mentioned already. They need help if stock to hold up well to a performance engine, but it can be easily done- for a price. Even a properly built TH350 or TH400 would be better for acceleration than the PG.

The thing is, you can cam yourself out of being able to use OD unless the rear gear ratio is very low- like 4.56 to 4.88. A 4.88 rear gear would give you a 3.42:1 ratio in OD. A 4.56 gear = 3.19, and that is about as low as you can go w/a relatively big cam w/o bringing the engine rpm down so far that OD becomes useless.

1Gary 12-10-2012 12:53 PM

I rarely post anything counter to Richard.I guess he is just answering the O/P's question.I does grade against me for any cam company to sell a cam for the "sound of it". It be begs the question what are we doing here??. Hate it.

cobalt327 12-10-2012 01:12 PM

Quote:

Originally Posted by Coolrider (Post 1619891)
Thank you for your advice. I am going to speak about it to my friend mechanic. You helps me in my plan and, also, thanks a lot to techinspector1. I chose the 283THR7 Tumpr cam. So... with that setup, i should be satisfied. Thanks once again to all of you with your great knowledge.

Harold.

Hopefully your trans guy knows the ins and outs of the throttle valve (TV) linkage adjustment- this is uber critical to the transmission lasting and not self destructing right away. Links to info on setting a carb up to correctly operate the TV cable is here.

cobalt327 12-10-2012 01:22 PM

Quote:

Originally Posted by Coolrider (Post 1619891)
Thank you for your advice. I am going to speak about it to my friend mechanic. You helps me in my plan and, also, thanks a lot to techinspector1. I chose the 283THR7 Tumpr cam. So... with that setup, i should be satisfied. Thanks once again to all of you with your great knowledge.

Harold.

Comp claims "...stock converter ok, best with 2000+ converter and gears...". I'd recommend at least 2500 stall and 3000 rpm stall would be even better if acceleration is important. The 2500 stall speed TC should be enough to keep it from pulling through the brakes at a stop sign.

Also, the distributor will need work to get enough initial timing w/o having too much mechanical timing. A stock distributor is just a starting point. Even an MSD distributor w/the black 18 degree advance bushing might not be enough. It's no big deal setting the distributor up, but it IS something that you'll definitely have to deal with before you're done.


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