Compression ratio ???? - Ford Mustang Forums : Mustang Forum
LinkBack Thread Tools Display Modes
post #1 of 3 Old 10-31-2005, 06:53 PM Thread Starter
Registered User
rotax's Avatar
Trader Feedback: (0)
Join Date: May 2000
Location: Lanaudiere, Canada
Posts: 1,205
Question Compression ratio ????

I have a question regarding compression ratio on my friend's turbo'ed 412W

He is building his Dart 3.85" stroke * 4.125" bore with a T-80BB ~7000rpm
He should be pushing the turbo to it's max, dunno how this will translate in boost figures, but whatever, what compression ratio you guy's think is optimum?

He'll be running race gaz anyways, and he has a large intercooler.His guesstimates are un the 1000-1100 fhp.

His builder, says 7.5- 8.0:1, while i think more 8.5:1
He has Oliver 6.200 rods, and they want to change them for something a little shorter to decrease CR.
He's having the cam custom made by Cam Motion and they said the big dog's run 7.XX:1 for compression ratio's, maybe they're right, but he's not building an engine that wild.

R331 GT47
rotax is offline  
Sponsored Links
post #2 of 3 Old 10-31-2005, 10:55 PM
Trader Feedback: (0)
Join Date: Mar 2003
Posts: 1,088
if he is wanting any real streetablility, i would not go under 8.1........8.5to1 would be ideal for street and strip in my humble opinion.....

hotwheels of

wyominghotwheels is offline  
post #3 of 3 Old 11-01-2005, 06:07 AM
Registered User
Erich's Avatar
Trader Feedback: (20)
Join Date: Jan 2000
Location: MD
Posts: 5,957
I agree-8 to 8.5:1 should be good for a street motor. But it is not going to be street if he is getting is it set up for race gas(?). It does sound like it will be on the wild side. If so, and he does not care about street driving maybe the builder and cam makers (and tuners!) advice is something to consider.

97 Laser Red GT-248A Wingless model, Built Lincoln Mark VIII motor-Procharger D1SC, 3 core IC
2012 Black GT-Saddle, 3.73s, Brembos, Shaker1000
Erich is offline  
Sponsored Links


Quick Reply

Register Now

In order to be able to post messages on the Ford Mustang Forums : Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome