Gold Lifetime Member
Join Date: Apr 2006
Location: Midlothian Illinois
Is 1100 rpm in neutral normal for a performance engine?
Last fall I finally installed my new engine. It seems to like a lot of timing and idles in neutral at about 11-1200. Any lower and when I put her in gear it stalls. It runs great at anything over 12-1300 rpm. Throttle response is instant. I have the Edelbrock Performer rpm flat tappet hydraulic cam, 64cc heads, timing chain, air gap mainfold, fuel pump, summit 1.5 roller rockers, Holley 650 vaccum secondary carb with electric choke, special length pushrods as recommended by Edelbrock, 2400 stall converter, 200r4 trans, headers, hi perf cap, coil etc.
Compression is 9.75 to 1. The cam is listed at 1500-6500 so maybe I'll never get the lower idle without a manual trans. The throttle idle screw is almost all the way out. If I set it to 18 or so initial timing I can get it down to 8-900 at idle but it dies when I put it in gear. Up around 20-25 it idles at 11-1200 and 8-900 in gear but hits 40-45 at 3000 rpm which worries me. I looked for vaccum leaks and if I put my hands loosely over the carb she will stumble and die. I have a CD ignition that I have yet to install, but I like to make changes one at a time. I checked top dead center before the heads where installed with a dial indicator at zero when the pointer also read zero. Is the high idle what I have to deal with since I have an auto trans and this combo, is my convertor too tight, or do I have a carb issue I need to explore? This is my first performance engine build and any help is appreciated. Off idle on up it runs great, and I know a larger carb would help power, but I had the same idle issues with a 750 double pumper and the economy was in the toilet, although power was better. I mainly want to cruise with some fully throttle bumps here and there and maybe a pass or two at the strip in time. Plugs, wires are good, everything on the engine is new, no leaks, and she runs 170-180 water temp, 40-50 psi oil when driving and trans 180-200 when warmed up.
Thanks in advance guys, this site is well worth the $20 a year to be a member.
Some videos I'v made for youtube
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