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Blue's 440 question
Posted: Thu Apr 28, 05 1:10 am
by Kev
Blue is dealing with a non-functioning Mac at present. Today I was over his workshop assisting with the first fire up of the 440. After a few problems we got it fired up and it sounded sweet. The headers started glowing cherry red so we set the timing to about 10 before. The motor idles sweet but the exhausts still seem to glow. We surmise a lean condition. What jets are you guys running in the front of a 750 vac sec on a 440 with a .484 cam. Just to get in the "zone", as it were. (He wouldn't spray it up with the ol' WD40 for the vac leak test!) TIA!
Posted: Thu Apr 28, 05 9:28 am
by Dave-R
If the exhaust is glowing at idle then obviously it is the idle circuits that are lean but anyway for a primary jet you should be around a #68 - #70.
Posted: Thu Apr 28, 05 4:19 pm
by Anonymous
I know this isn't something that Blue would overlook, but just incase, is the cam timing correct?
Posted: Tue May 10, 05 4:12 pm
by Blue
Well I'm back! managed to totally crash me Mac! Up and running on OS10 Panther now and everythings peachy! I thought I was running lean but I'm not so sure, I could wind the idle screws all the way in or out and it made no difference. Found that I had to bend the tab on both floats to keep the fuel level under control. Also noticed I had a lot of transfer slot showing at where it wanted to idle, so I tried to open up the secondaries a little to get some more air in, no luck siezed screw! Next step, drilled 1/16" hole in the primary blades, made no differance so went in again with 1/8". This allowed me to close the primaries a little but still not enough as I still have a little vacuum showing at the dizzy port, but I can stall the motor with the idle screws now so I'm beginning to get it under control. Headers are not glowing now and my eyes have stopped stinging so I'm headed in the right direction! I might try a bit more advance before I get too carried away, I have the initial set at 12 degrees at the mo. so I will bump it up to 15 and see what happens. Blimey it's been 5 years since I last had the chance to tune my own engine!
Posted: Tue May 10, 05 5:30 pm
by Ivor
Top news Blue!
I thought glowing headers was a bit serious for you! Anyway mate you can give us an update at Shakey.
Posted: Tue May 10, 05 6:17 pm
by Pete
Good news, and Great to see you back !
Posted: Tue May 10, 05 7:15 pm
by TrevD
nice one blue , i supose you will be needing the spacer for thr trans now, and your in luck it is the first thing i programed on my new machine and is all but finished , when do you want it?
Posted: Tue May 10, 05 8:04 pm
by TrevD
ok , i got off my butt and finished it . is this the sort of thing you need?
Posted: Tue May 10, 05 9:30 pm
by Blue
Spot on as ever Trev! Are you coming up to shakey this weekend?
Posted: Tue May 10, 05 9:47 pm
by TrevD
no im not but i think a few of my mates are , i could get it up thare if you like , i need to work , im now working on a billet 727 sump with internal and external cooling fins , should look realy cool from inside and out but shame it will never be seen.