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Author Topic:   Jetting question
A2KY2K88
Member
posted August 14, 2004 06:17 PM
What is the rule of thumb when about jetting when you go from a 377 to a 400??

Thanks

jay116
Member
posted August 15, 2004 08:25 AM
If you are using the same intake and headers I would leave the jets alone till you can run the car and then check your jetting.
I would leave it alone even if you did change.

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Jason Boivin
http://www.rcracing-team.com


A2KY2K88
Member
posted August 15, 2004 10:15 AM
The bore is bigger, the stroke is longer and the cam is bigger so wouldn't you have to jet up to get more fuel into the motor?


jay116
Member
posted August 15, 2004 06:11 PM
You might but for firing it and break in you will be fine. You have to get the car up to speed on the track and then check your plugs to decide on your jetting.
My boss is running a 350 making 500hp and he is running 73 jets and its still rich. You have to get on the track to make a final decision.
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Jason Boivin
http://www.rcracing-team.com

[This message has been edited by jay116 (edited August 15, 2004).]

lordantonio
Member
posted August 17, 2004 08:27 AM
The bigger motor will send a stronger signal to the boosters and pull more fuel through the same jet (all other things being equal). So if it's right on now, it won't be far off if off at all with the 400.


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