Results 1 to 3 of 3

Thread: High RPM flutter and pop in Div 3 pulling truck

  1. #1

    High RPM flutter and pop in Div 3 pulling truck

    Need some advice guys, Have a 468 big block with oval port big valve heads,10.5 comp ratio, Team G intake, modified 850 dbl pumper w/50cc pumps on both ends, and correct squirters and screws, #86 jets in primaries and #90 in secondary, Lunati solid lifter cam, gear drive, K-motion K1000 valve springs, checked and pressure is good. Brand new MSD ign. 6AL box, Pro Billet Dist, Blaster 2 coil, Taylor 409 10.4 wires. Holley Blue pump w/ reg, all #8 stainless lines, Running 7psi fuel press. Running VP110 fuel,We have been fighting a flutter and pop starting around 3000 RPM and never coming out of it it will go ahead and turn 8500 but it is fluttering all the way through the range, We have changed all the ignition parts and have not made any difference. It seems to be heat related cold starts it doesnt do it as bad. Was told have a lean condition need to increase jet sizes by 2-4 sizes. Plugs look fairly good a little gray but not too bad, I am just lost guys, any help would be greatly appreciated, Thank you, Dennis

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Jan 2004
    Location
    central Illinois
    Posts
    459

    High

    Maybe fuel pressure. Do you have a pressure gage where you can look at it while pulling a load wide open throttle?

    Blue pump is not much flow. 110 GPH. Most good pumps are 350-450 GPH

    Areomotive A2000 is a good one.

    Guy from Monee Illinois has a new one for sale for $300 under Fuel Systems section of ads on this site.

  3. #3
    Thank you for replying, No we cant see the pressure while pulling just have a small gauge under the hood. after it warms up a little you can get it to start fluttering while setting still, the pressure is not dropping while running the throttle under the hood. But it still has that fluttering around 3500 on up, I've got some bigger jets on the way and my friend has a magnafuel pump that we are going to try. Hopefully I can see something change, either get worse or get better, everything I have done has not changed anything even a little, So we'll give it a try and see what happens.. Thanks again, I really appreciate the advice!!


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Email us - Support@RacingJunk.com
Call us - 866.326.9227
Copyright © 2005-2016 RacingJunk.com All Rights Reserved.

Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the RacingJunk.com
Terms of Use, Classifieds Disclaimer, Privacy Policy, and Cookie Policy