HOME FORUM RULES CONTACT
     
   
   

Go Back   CLASS RACER FORUM > Class Racer Forums > Stock and Super Stock Tech
Register Photo Gallery FAQ Community Calendar

Reply
 
Thread Tools Display Modes
Old 03-27-2010, 12:04 PM   #1
Alan Roehrich
Veteran Member
 
Alan Roehrich's Avatar
 
Join Date: May 2006
Location: Murfreesboro TN
Posts: 5,105
Likes: 1,564
Liked 1,789 Times in 408 Posts
Default Re: Turbo 250 or 350

Nope, a 350 will not explode at RPM in excess of 7000. I've built them since 1984, and never seen one explode, and that includes a lot of race transmissions.

Nothing explodes like a TorqueFlite!!!!!!!
__________________
Alan Roehrich
212A G/S
Alan Roehrich is offline   Reply With Quote
Old 03-27-2010, 03:34 PM   #2
Caperat
Junior Member
 
Join Date: Jun 2006
Location: CANADA
Posts: 76
Likes: 0
Liked 0 Times in 0 Posts
Question Re: Turbo 250 or 350

Didn't Keith Lynch Run A Metric 200 or 250 something behind his 375 -- 396 B/SA with a steady diet of Royal Purple and it worked like a swiss watch? I think that it might have been a Scott McClay piece.
Caperat is offline   Reply With Quote
Old 03-27-2010, 03:42 PM   #3
Chipper Chapman
Member
 
Chipper Chapman's Avatar
 
Join Date: Jan 2004
Location: Belmont N.S. Canada
Posts: 473
Likes: 246
Liked 166 Times in 71 Posts
Default Re: Turbo 250 or 350

350 with 250 shafts and drums, lightens them up almost 10 pounds, cut some off thepump so its a little less volume, cheap and effective. Told it can be worth over 10hp at the wheels with a small block, but haven't yet tested it myself. Don't worry about rpm.

Last edited by Chipper Chapman; 03-27-2010 at 03:44 PM.
Chipper Chapman is offline   Reply With Quote
Old 03-27-2010, 04:17 PM   #4
FED 387
VIP Member
 
Join Date: Jun 2006
Posts: 3,417
Likes: 522
Liked 330 Times in 178 Posts
Default Re: Turbo 250 or 350

A coupla things--- I am NOT A TRANS EXPERT----Only telling you what I have observed/heard in the pits!!!! Guys like Keith Lynch I will bet do lotsa maintainence on their cars and they have these cars apart and back together monitering their equiptment and doing preventative work to keep them in tip top shape---

If you ever saw the inside of a McClay 200 compared to a stock trans you would understand why he gets as much as he does for a trans!!!! Lotsa hand made or reworked beefed up parts in them very little stock stuff---

Some racers put a trans in and run it for a whole season or 2 and never even change the fluid or filters while others have em apart every so many runs--- whatever works BEST with/for your combo is what you should run--Don't be afraid to experiment!!--Look around you and see what a racer with a combo like yours is using ,ask lots of questions ,talk to the really reputable trans/convertor guys most will point you in the right direction while some will tell you anything to sell you something. Nobody is gonna give you their deep dark secrets but many will help you get close in performance.
FED 387 is online now   Reply With Quote
Old 03-27-2010, 04:36 PM   #5
Robert Swartz
Senior Member
 
Robert Swartz's Avatar
 
Join Date: Aug 2008
Location: Nineveh, Indiana
Posts: 512
Likes: 0
Liked 3 Times in 3 Posts
Default Re: Turbo 250 or 350

Quote:
Originally Posted by FED 387 View Post
Some racers put a trans in and run it for a whole season or 2 and never even change the fluid or filters while others have em apart every so many runs--- whatever works BEST with/for your combo is what you should run--Don't be afraid to experiment!!--Look around you and see what a racer with a combo like yours is using ,ask lots of questions ,talk to the really reputable trans/convertor guys most will point you in the right direction while some will tell you anything to sell you something. Nobody is gonna give you their deep dark secrets but many will help you get close in performance.
These are probably some of the best words I've heard. This has turned into an interesting thread. What it will do for me? Lead me to do more investigation. For those of us, yet to make it to the track. Discussions like these yield a lot of information to help with future decisions.

Still going with a T-350 to start with.
__________________
Robert Swartz - Swartz & Lane 66 Chevy II Pro
95 Achieva EF/SA, 78 Mustang II U/SA (work in progress) #354 stock
Robert Swartz is offline   Reply With Quote
Old 03-27-2010, 04:39 PM   #6
Alan Roehrich
Veteran Member
 
Alan Roehrich's Avatar
 
Join Date: May 2006
Location: Murfreesboro TN
Posts: 5,105
Likes: 1,564
Liked 1,789 Times in 408 Posts
Default Re: Turbo 250 or 350

Robert, the box I described runs in the 427/425 Camaro in A or AA for two years and hundreds of passes. Looks as good when it comes out as it does going in. I freshen it purely out of guilt.
__________________
Alan Roehrich
212A G/S
Alan Roehrich is offline   Reply With Quote
Old 03-27-2010, 06:09 PM   #7
buzzinhalfdozen
Senior Member
 
Join Date: Sep 2006
Location: Bellevue Ohio
Posts: 984
Likes: 0
Liked 11 Times in 8 Posts
Default Re: Turbo 250 or 350

I've run a Coan 350 for a little over a season now. Although I had to redo a few things in it after 70 runs tore down and everything looks good. Of course I have no real power but do give it some RPM shift @ 9800, near 10.000 at the stripe. So I'd say RPM is not an issue. Good luck with what ever you chose. Joe
__________________
Joe Buchanan SS/BX 3117
buzzinhalfdozen is offline   Reply With Quote
Old 03-27-2010, 04:18 PM   #8
Alan Roehrich
Veteran Member
 
Alan Roehrich's Avatar
 
Join Date: May 2006
Location: Murfreesboro TN
Posts: 5,105
Likes: 1,564
Liked 1,789 Times in 408 Posts
Default Re: Turbo 250 or 350

The 250 forward input drum is a lock up drum, and is the same as a 350 forward input drum. The 250 direct drum has no sprag, you cannot use it in a 350 or you will not have 2nd gear.

The output shaft from a 250 is "gun drilled" and slightly lighter. The sun gear shell from a 250 is "swiss cheesed" and slightly lighter. Combine them with an ATI aluminum forward input drum and an ATI aluminum direct drum and you have a light 350.
__________________
Alan Roehrich
212A G/S
Alan Roehrich is offline   Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 02:32 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.
Copyright Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.