Hi all, i recntly thort my timing was way out so i bought a timing strobe ,... and guess what it was ... It was firing about 2 degrees BTDC :S not good ... So i have now changed it to 8 degrees ATDC ... the car has chabnged amazinly and i can feekl more power. However is 8 degrees right? or could i squeeze a bit more power with a different setting? My spec is
998
HS4
Stage 1
12G295
Sports Coil + Leads
Also what needle you think i shouild run? ..Its currently AAU
Cheers Chris
Timing ... So much better but cn i get more?
Started by
01smartc
, Feb 22 2007 10:27 AM
1 reply to this topic
#1
01smartc
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One Carb Or Two?
Posted 22 February 2007 - 10:27 AM
#2
dklawson
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Moved Into The Garage
- Name: Doug
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Posted 22 February 2007 - 01:05 PM
Did you buy a fixed timing light or one with an adjustable "advance" setting knob?
You can squeeze more out of your timing... to a point. With an advance timing light, set the knob to about 32 degrees. Disconnect and plug the vacuum advance on your dizzy, then start the engine and use the idle screws to bring the RPM up... WAY up. Hold the engine at something close to 4000 RPM. While the engine is at that speed, and with your advance timing light set to 32 degrees, align the zero timing pointer and mark on the pulley. Tighten the dizzy clamp and reset your idle speed. Test drive the car, particularly by accelerating uphill in too high a gear (i.e. Accelerate up a hill in 4th gear that you would normally take in 3rd). If the car pings, re-adjust the timing, backing it off from 32 degrees to 30. Repeat this until you have no more pinging.
By holding the engine at about 4k RPM, the maximum mechanical advance from the dizzy has been applied. Moving the dizzy at this point sets the absolute maximum advance your car will ever see. Test driving your car after this confirms whether or not the starting point of 32 degrees is acceptable for your engine based on its condition and the particular fuel you're buying. This procedure can also be done if you bought a fixed timing light but it requires you to add a second timing mark on the pulley so it's a bit more involved.
So, the short answer to your question is "yes", you probably can keep advancing the timing. The limiting factor is where/when you start hearing pinging when accelerating under load. Once you hear the pinging, back off about 2 degrees.
You can squeeze more out of your timing... to a point. With an advance timing light, set the knob to about 32 degrees. Disconnect and plug the vacuum advance on your dizzy, then start the engine and use the idle screws to bring the RPM up... WAY up. Hold the engine at something close to 4000 RPM. While the engine is at that speed, and with your advance timing light set to 32 degrees, align the zero timing pointer and mark on the pulley. Tighten the dizzy clamp and reset your idle speed. Test drive the car, particularly by accelerating uphill in too high a gear (i.e. Accelerate up a hill in 4th gear that you would normally take in 3rd). If the car pings, re-adjust the timing, backing it off from 32 degrees to 30. Repeat this until you have no more pinging.
By holding the engine at about 4k RPM, the maximum mechanical advance from the dizzy has been applied. Moving the dizzy at this point sets the absolute maximum advance your car will ever see. Test driving your car after this confirms whether or not the starting point of 32 degrees is acceptable for your engine based on its condition and the particular fuel you're buying. This procedure can also be done if you bought a fixed timing light but it requires you to add a second timing mark on the pulley so it's a bit more involved.
So, the short answer to your question is "yes", you probably can keep advancing the timing. The limiting factor is where/when you start hearing pinging when accelerating under load. Once you hear the pinging, back off about 2 degrees.
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