Autocross/Road Race Motor - Page 2 - Lateral-g Forums

bighead · #11 11-21-2011, 12:38 AM

Quote:

Originally Posted by Flash68

Ha. I was right. This motor did just show up today in the classifieds of a site I mentioned... sounds about right, and it is/was indeed a drag motor.

For a nice autoX/road race motor, here's what I would want and I am looking for in my next generation of powerplant and I have the same/similar goals.

650-700hp to peak at no higher than 7k rpm, and still maintain solid mid range torque and decent enough low end for drivability and autoX. You can get there with enough cubes and a big solid roller if you want a small block such as the one you posted.

Thanks for the advice. Do you have any suggestions of any crate motors that fit this bill or anyone that has one for sale?

**Flash68** · #12 11-21-2011, 12:57 AM

Honestly I would not recommend a "crate" motor for what you are looking for. I am assuming your motor/power goals are similar to what the ad was for, or was that not pretty close to what you are looking for?

If you truly are looking for close to 700hp out of a 400+ cube stroker Ford motor, I would talk to a reputable engine builder to build one for you. Most of the stroker small block "crate" motors I've seen are not value priced enough (vs a custom spec'd motor) and do not make the power I want, and presumably you want.

If 700 hp isn't a # you are shooting for, what is your target range?

bighead · #13 11-21-2011, 07:13 AM

Quote:

Originally Posted by Flash68

Honestly I would not recommend a "crate" motor for what you are looking for. I am assuming your motor/power goals are similar to what the ad was for, or was that not pretty close to what you are looking for?

If you truly are looking for close to 700hp out of a 400+ cube stroker Ford motor, I would talk to a reputable engine builder to build one for you. Most of the stroker small block "crate" motors I've seen are not value priced enough (vs a custom spec'd motor) and do not make the power I want, and presumably you want.

If 700 hp isn't a # you are shooting for, what is your target range?

I would be fine with something around 500HP and 500 ft/lbs of torque. So you think an engine builder would be a cheaper route to go than a "crate"?

**GregWeld** · #14 11-21-2011, 07:48 AM

For a street motor - a crate motor is fine.... but if you want to really track the car... and you want the motor to live - you'll be money ahead to have it built. That is IF you choose a builder that builds the type of motor you want and is a quality builder.

The motor in my Mustang - is a 355 stroker SBF - based off a R302 Ford block... and makes 590hp. The car weighs 3015 pounds. AND the builder says to bring it back for freshening every 40 hours.... IF you're going to wing it to 7000+ regularly. The motor was specifically purpose built.

I can't imagine a crate motor taking that kind of flogging and making it half as long even if you cut the rpms to 5500...

The bearings - the springs - the "weight of the reciprocating assembly" etc is just going to work against you.

Jr · #15 11-21-2011, 08:22 AM

Bighead,

Do you plan on driving this mustang on the street? Will this car be a decided auto-x/road course car? Also, what city are you in? There are some awesome engine builders all over.

bighead · #16 11-21-2011, 03:45 PM

Quote:

Originally Posted by DJW32

Bighead,

Do you plan on driving this mustang on the street? Will this car be a decided auto-x/road course car? Also, what city are you in? There are some awesome engine builders all over.

Hey thanks for the response. I will be a street car but would like to take it to the occasional Auto Cross/Road Race. I am located in Eastern NC.

Jr · #17 11-21-2011, 04:31 PM

See...you have some good engine builders near you.

If it was my car, I would look either at a newer fuel injected ford motor or a simple 351 carb motor. You can always stroke the 351 for more cubes. You don't need a "race motor" for what you want to do. I think you need a well build motor to reach your goals.

**GregWeld** · #18 11-21-2011, 04:35 PM

I agree -- your statement "from time to time" is the big "X" factor.... Many here will tell you that "from time to time" has turned into "ALL THE TIME"

And weekends sitting in lawn chairs behind their car has turned into wrenching and sitting behind the wheel foot to the floor.

Chad-1stGen · #19 11-21-2011, 05:49 PM

Whether you use a crate motor or a custom built motor, one thing won't change.

As power goes up, motor longevity usually goes down. If the motor has to work hard to make the power you want it won't last as long.

bighead · #20 11-21-2011, 11:43 PM

Quote:

Originally Posted by DJW32

See...you have some good engine builders near you.

If it was my car, I would look either at a newer fuel injected ford motor or a simple 351 carb motor. You can always stroke the 351 for more cubes. You don't need a "race motor" for what you want to do. I think you need a well build motor to reach your goals.

Do you have the names/phone numbers or websites of these "good engine builders"?

Thanks!