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Thread: Ignition timing - Gasoline vs Methanol

  1. #1

    Ignition timing - Gasoline vs Methanol

    Is there a different ignition timing requirement for methanol as compared to gasoline (for drag racing)? If so, do these differences change according to engine size, i.e. 350 versus 598 CID?

    Thanks

  2. #2
    Senior Member RACING JUNKIE
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    Timing does change for bigger ci stuff, my gas carb actually runs at less timing them my alky. But when I ran small blocks the alky was 7-8 degrees less on alky.
    David Lanning
    IHRA NHRA 387B

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  3. #3
    Senior Member RACING JUNKIE
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    Quote Originally Posted by hammertime
    Timing does change for bigger ci stuff, my gas carb actually runs at less timing them my alky. But when I ran small blocks the alky was 7-8 degrees less on alky.
    What are you running on timing now?

  4. #4
    Senior Member EXPERT BUILDER
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    I think it said 35 degrees on the dyno sheet he has posted...
    Josh VanHorne

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  5. #5
    Senior Member RACING JUNKIE
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    Quote Originally Posted by DragsterJosh
    I think it said 35 degrees on the dyno sheet he has posted...
    correct 35 degrees
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  6. #6
    Senior Member RACING JUNKIE
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    I'm running 35 now but was thinking about running 38,39 degrees. Mines just a 535 though.

  7. #7
    Senior Member RACING JUNKIE
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    I've yet to try and lower mine any, I was happy on the dyno so I didnt mess with it. Ran it there last year also. You may try going a few and see what it does.

    I remember my 468 a few years back @ 39 degrees ran 8.40's, I decided to go 33 with it ran 8.20's. Slapped a different intake on it and moved it to 32 and it ran 8.0's, not to shabby for $1500 short block, in a 2010lb car
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  8. #8
    Senior Member RACING JUNKIE
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    Quote Originally Posted by hammertime
    I've yet to try and lower mine any, I was happy on the dyno so I didnt mess with it. Ran it there last year also. You may try going a few and see what it does.

    I remember my 468 a few years back @ 39 degrees ran 8.40's, I decided to go 33 with it ran 8.20's. Slapped a different intake on it and moved it to 32 and it ran 8.0's, not to shabby for $1500 short block, in a 2010lb car
    Hehe that's funny David,

    Think about it, 10's of thousands of dollars spent on motors, a new chassis 100 lbs lighter, and a gain of 1/2 second over the cheapo 468. The reason i think this is funny, is the cheapo 468 i built for the 3700lb Biscyne, stock steel crank, 804 rods, and a set of $425.00 probe 10.2 comp. ratio on pump gas, actual cost was less than $1,000.00 short blk. it's running 10.50's @ 126mph on DOT Hooser street slicks, no one believes it's a 468, there's been estimates from 502 to 540", but we just grin and go on with it :lol:

    Zip.


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