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Post a reply to the thread: Timing Q2
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Kev i was going to suggest giving Steve cross a call who might of been able to help but i couldnt find his number and i know its on here somewhere
it would appear its sorted now
Typical, late for everything me
He does like to keep me occupied !
its antons kev.........gonna be unusual
Added 4 degrees (14btdc toa stock 12 ) and problem seems sorted. Weird thing is that the timing mark snow agree with or without dialback ...go figure .
I know the mech advance is working but haven't checked the vacuum, made the mistake of assuming it must be right because it's new...I should know better.
Glowing header pipes normaly means late firing if my memory servs me right Kev. The advance is working init?
Bit of along one ( ooerr ) as the background may be relevant .
We've just rebuilt totally Antons Oddfire Buick V6 .
When we redid this engine it was fitted with an evenfire timing cover which has a removeable timing number bracket. The original oddfire cover has a cast in timing mark. The Pat Ganahl book says there is 18 degrees difference between the two marks.
With the heads still off we set number 1 piston at TDC of rock ,ie when it's centre of it's null travel at the top of the stroke. We had a spare bolt on timing mark so modified this so that it sat at 0tdc mark but this only actually moved it 10 degrees from it's old position. So if anything we are conservative if we haven't got it right ie retarded not advanced
I aligned the 3 firing triggers inside the HEI with the static timing set at TDC and we started the motor .One of the headers was glowing red ,so stopped it and advanced it manually to 10 BTDC ( stock Oddfire timing is 12 BTDC ).It fired and the glowing went away .
However I then checked the timing using a dial back light and using the established TDC mark it showed only 2 BTDC ? I then advanced it back to 10 BTDC (don't want to put full adance plus more in yet on a fresh engine.)
After a run out in the dark he came back to see the two rear pipes glowing red .Just been up there to check the timing (and after aconversation with Paul Nichols this morning ) I dialed the baseline just using the non dial back mode which showed up as 10BTDC ( using OUR established marks ) but the dial back to TDC showed it at only 4 BTDC ?
What's happening ? The Holley 390 is set up with mixture screws at 1 3/4 turns to give best vacuum ,plugs are looking off white to just starting to sandy brown.
We've now pulled the home made baffles in his headers /sidepipe as the internal outlet is only the same size as his primary pipes so I'm thinking that this may be restricting the exhaust gas and causing a heat build up in the ( rearmost ) pipes ?
We can't take it for a run until it gets dark and need to worry about puddles mixed witha glowing hot stainless exhaust manifold.
Any input on :-
1) Timing problem
2) reason for glowing header pipe (bearing in mind the possible timing issue)
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