IGNITION TIMING - ANY DYNO INFO ?

HELI-ARC on July 22nd 2010, 1:01 pm

Just looking for someone who has some experience on a dyno, We just built a 429 deal with dove-c heads. looking to find out where total timing should be for the dove plug locations.
Thanks in advance for the help.

Looked for old posts but no luck.

dfree383 on July 22nd 2010, 2:10 pm

33 to 36 total depending on pistons.

HELI-ARC on July 22nd 2010, 2:44 pm

Old scj pistons (forged) flat top one eye browe

dfree383 on July 22nd 2010, 2:50 pm

should like the lower end of what I posted. but you'll have to try it, make a pass, and do it again to find what it likes.

Carl on July 22nd 2010, 6:20 pm

Too many variables. I've had iron headed stroker's that liked 28 degrees, iron headed 460's that wanted 40 degrees, and alum headed engines anywhere between. Cam timing, quench, compression, displacement, all play a role. Take it to the track, start with 30 degrees and tune from there.

the Coug on July 22nd 2010, 7:44 pm

my 492 iron headed engine liked 38*

Randy

BOSS 429 on July 23rd 2010, 2:01 am

yup no 2 are ever really the same, ive got a iron headed one thats likes 44 total,but its a pump gas engine

dfree383 on July 23rd 2010, 3:31 am

Carl wrote:Too many variables. I've had iron headed stroker's that liked 28 degrees, iron headed 460's that wanted 40 degrees, and alum headed engines anywhere between. Cam timing, quench, compression, displacement, all play a role. Take it to the track, start with 30 degrees and tune from there.

I've never seen those extreams, you sure the timing marks where correct? 40 on a ford doesn't sound right.

Carl on July 23rd 2010, 8:48 am

dfree383 wrote:
Carl wrote:Too many variables. I've had iron headed stroker's that liked 28 degrees, iron headed 460's that wanted 40 degrees, and alum headed engines anywhere between. Cam timing, quench, compression, displacement, all play a role. Take it to the track, start with 30 degrees and tune from there.
I've never seen those extreams, you sure the timing marks where correct? 40 on a ford doesn't sound right.

Yes, I'm sure.

dfree383 on July 23rd 2010, 9:11 am

Carl wrote:
dfree383 wrote:
Carl wrote:Too many variables. I've had iron headed stroker's that liked 28 degrees, iron headed 460's that wanted 40 degrees, and alum headed engines anywhere between. Cam timing, quench, compression, displacement, all play a role. Take it to the track, start with 30 degrees and tune from there.
I've never seen those extreams, you sure the timing marks where correct? 40 on a ford doesn't sound right.

Yes, I'm sure.

sounds like something was wrong??? Or it was a procomp head with a real big dome like a chevy. The chambers in those heads suck. I've never seen a flat top ford Iron head want that much. Even in domed motors with CJ irons 36 was about right.

Carl on July 23rd 2010, 10:10 am

dfree383 wrote:
Carl wrote:
dfree383 wrote:
Carl wrote:Too many variables. I've had iron headed stroker's that liked 28 degrees, iron headed 460's that wanted 40 degrees, and alum headed engines anywhere between. Cam timing, quench, compression, displacement, all play a role. Take it to the track, start with 30 degrees and tune from there.
I've never seen those extreams, you sure the timing marks where correct? 40 on a ford doesn't sound right.

Yes, I'm sure.

sounds like something was wrong??? Or it was a procomp head with a real big dome like a chevy. The chambers in those heads suck. I've never seen a flat top ford Iron head want that much. Even in domed motors with CJ irons 36 was about right.

No, nothing was wrong. The combination performed exactly as planned.

dfree383 on July 23rd 2010, 11:09 am

very low compression? 7.5-8.5:1?

DJOHAGIN on July 23rd 2010, 10:51 pm

Carl wrote:
dfree383 wrote:
Carl wrote:Too many variables. I've had iron headed stroker's that liked 28 degrees, iron headed 460's that wanted 40 degrees, and alum headed engines anywhere between. Cam timing, quench, compression, displacement, all play a role. Take it to the track, start with 30 degrees and tune from there.
I've never seen those extreams, you sure the timing marks where correct? 40 on a ford doesn't sound right.

Yes, I'm sure.

LOL.

Mmm, lets think here for just one second. Carl builds crate engines for a living. Carl has done more than his fair share of dyno testing. Is Carl sure? I'm sure he is.

Maybe not on a dyno, but there have been individuals that have gone faster with up to 42-44 degrees and a rich mixture.

Something to think about,

Dave

1Bad91 on July 24th 2010, 12:08 am

INteresting....seriously. I wonder what my motor likes....lol

dfree383 on July 24th 2010, 6:25 am

DJOHAGIN wrote:
Carl wrote:
dfree383 wrote:
Carl wrote:Too many variables. I've had iron headed stroker's that liked 28 degrees, iron headed 460's that wanted 40 degrees, and alum headed engines anywhere between. Cam timing, quench, compression, displacement, all play a role. Take it to the track, start with 30 degrees and tune from there.
I've never seen those extreams, you sure the timing marks where correct? 40 on a ford doesn't sound right.

Yes, I'm sure.

LOL.

Mmm, lets think here for just one second. Carl builds crate engines for a living. Carl has done more than his fair share of dyno testing. Is Carl sure? I'm sure he is.

Maybe not on a dyno, but there have been individuals that have gone faster with up to 42-44 degrees and a
rich mixture.

Something to think about,

Dave

thought about it........ If you need that much timing to make

something like a dove headed, flat top motor run. You got something wrong 1) the timing marks are off 2) you have something wrong with the combo 3) your running absolutly horrid swamp gas (detonation likley)

Other things that can contribuite to high timing requirements are very poor dome or excessively high dome designs or ultra low compression (read innefficient)

What 40-44 degrees of timing requirement should tell you is that something way wrong and extreamly inefficient. When motor want less timing to make power that's an indicator of an efficient engine.

I don't car how many crate motors someones built it doesn't make excessive timing correct.

IGNITION TIMING - ANY DYNO INFO ?

IGNITION TIMING - ANY DYNO INFO ?

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Re: IGNITION TIMING - ANY DYNO INFO ?

Re: IGNITION TIMING - ANY DYNO INFO ?

Re: IGNITION TIMING - ANY DYNO INFO ?

Re: IGNITION TIMING - ANY DYNO INFO ?

Re: IGNITION TIMING - ANY DYNO INFO ?

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Re: IGNITION TIMING - ANY DYNO INFO ?

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