will carb flow enough
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=11725
Printed Date: September-26-2024 at 12:20am
Topic: will carb flow enough
Posted By: grumpidad
Subject: will carb flow enough
Date Posted: August-27-2008 at 1:38am
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I have seen pictures of the use of the 4160 carb being used after heads,cam,intake change on this site. Just wondering how well it works, haven't heard anyone really say much about the carb.I'm sure it would need some jetting done but has anyone heard of leaning out or just not having enough air flow to keep up with the other upgrades to motor.I am asking cause this will be my winter project and just want to make sure it will be ready as can be come the first warm day of spring. ------------- grumpy88 |
Replies:
Posted By: horkn
Date Posted: August-27-2008 at 3:58am
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You really don't need to do anything to that 4160 to make it work once you have added better heads , cam and intake.
The carb will only throw as much fuel in as the motor needs. ------------- 78 martinique- refloored, reinforced, stringers re glassed, re engineered interior GT40P heads Edelbrock Performer intake acme 4 blade http://img.photobucket.com/albums/v64/horkn/fish/nautique.jpg |
Posted By: TRBenj
Date Posted: August-27-2008 at 12:51pm
I wouldnt say thats an accurate statement. Depending on the mods, jetting changes may be necessary to ensure youre not running lean with the better flowing parts. That being said, the stock carb size on these boats generally do not cause an issue with air restriction, even when adding top end mods (head/intake/cam). Check out this http://www.4secondsflat.com/Carb_CFM_Calculator.html - CFM calculator , and you'll notice that unless you plan to turn more than 5900 RPM, or you increase the displacement (stroker kit), then the stock sized 600cfm 4160 should be sufficient in supporting a 351w (even if you assume 100% volumetric efficiency, which is likely to be closer to 85-90%, realistically). Im running the stock 600cfm 4160 (with slightly fatter jets) on my 351w with an upgraded top end, and I have no problem turning 5200rpm. ------------- |
horkn wrote:Posted By: grumpidad
Date Posted: August-27-2008 at 4:34pm
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Thanks alot for the info. ------------- grumpy88 |