Engine loses power after launch
#11
Member
MASTER JOURNEYMAN
Thread Starter
Join Date: Sep 2007
Posts: 40
The carb is a Demon 1090 Dominator, and yes it has a primary power valve (6.5) and secondary (plugged) according to the specs. I pulled up on the Demon site. I know less than nothing about power valves.
#15
Senior Member
SENIOR BUILDER
Join Date: Feb 2005
Location: LAWTON MI
Posts: 113
A 6.5 power valve sounds high to me for a 700 hp NA small block. but That should cause a rich low speed problem not what he has described.
Vent tube spill over and rear power valve installed in a hard leaving car sound like probable cause for symptoms described but sounds like he has the covered.
Vent tube spill over and rear power valve installed in a hard leaving car sound like probable cause for symptoms described but sounds like he has the covered.
#16
Member
MASTER JOURNEYMAN
Thread Starter
Join Date: Sep 2007
Posts: 40
I haven't had the chance to get an accurate vacuum measurement yet....just too busy at work. I hope to do it today. I have a feeling the power valve is the culprit, based on some of the input here. Thanks.
#18
Senior Member
DYNO OPERATOR
Join Date: Aug 2005
Location: Rifle Colorado
Posts: 585
Not trying to be a prick, but are you absolutely sure (you've checked) that the jet extensions are in the rear, not the front? Been there, done that.....also check to see if you have a starter cable or other wire that might contact the header during launch. Haven't done that, but I've seen it....
Johnny
Johnny