SBC NASCAR V8 firing order
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SBC NASCAR V8 firing order
Does anyone know the firing order of Chevrolet NASCAR V8 engine? Is there any advantage of using it on a regular 18436572 engine for less crank fatigue and better cylinder filling?
Re: SBC NASCAR V8 firing order
Firing order is still 18436572 in chevy's Nascar RO7 engine and that is mandated by the rules. If you want some better harmonic crankshaft loading, use the LS firing order, 18726543. This is what some now call the 4-7 & 3-2 swap.
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Re: SBC NASCAR V8 firing order
Thanks Newold1 that is what i was looking for. Someone I know had a new cam ground with the 4-7,3-4 swap and the idle sounds a little different , and picked up little in performance.
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Re: SBC NASCAR V8 firing order
Also, Ford 351 Cleveland, 351 Windsor and 351M-400 firing order since 1969.
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Re: SBC NASCAR V8 firing order
" Cleveland firing order is 13726548 "Walter R. Malik wrote: ↑Mon Oct 22, 2018 7:09 pmAlso, Ford 351 Cleveland, 351 Windsor and 351M-400 firing order since 1969.
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Re: SBC NASCAR V8 firing order
Think 'firing pattern', draw it out and all will be revealed.Scott wrote: ↑Thu Oct 25, 2018 2:10 am" Cleveland firing order is 13726548 "Walter R. Malik wrote: ↑Mon Oct 22, 2018 7:09 pmAlso, Ford 351 Cleveland, 351 Windsor and 351M-400 firing order since 1969.
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Re: SBC NASCAR V8 firing order
NO.
Diagram it?
13726548 - ford
26543187 - convert the cyl # to GM # from ford numbering
18726543 - then start at #1
Diagram it?
13726548 - ford
26543187 - convert the cyl # to GM # from ford numbering
18726543 - then start at #1
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Re: SBC NASCAR V8 firing order
YES ... the "Pattern" is the same; the cylinders are simply identified and numbered differently.John Wallace wrote: ↑Thu Oct 25, 2018 7:05 am NO.
Diagram it?
13726548 - ford
26543187 - convert the cyl # to GM # from ford numbering
18726543 - then start at #1
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Re: SBC NASCAR V8 firing order
This should help
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bigjoe1 wrote:By the way, I had a long talk with Harold(Brookshire) last year at the PRI show. We met at the airport and he told me everything he knew about everything.It was a nice visit. JOE SHERMAN RACING
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Re: SBC NASCAR V8 firing order
Isn't there also a cooling advantage moving the adjacent firing cylinders to the front of the block?
Re: SBC NASCAR V8 firing order
Since 90° @ 6,000 RPM is only 2.5 milliseconds between firing #5 and #7 vs. 10 ms. until the pattern repeats, I think there's far too much thermal mass for any measurable temperature fluctuation to occur between cycles either way.
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