crossflow timing

[jerseyvixen]

hi how possable is it for a ford xflow to slip its timing

[marshalla]

rare, and difficult if the chain and sprockets are in good condition and properly tensioned.

[Stig]

Exactly. If it's standard, then unless the chain tensioner has worn out/broken, then it's pretty unlikely. Are you sure that's the problam?

If you're running vernier pulleys then it may possible for them to slip if they're not pegged I guess.

[jerseyvixen]

engine near race tune 1760 steel . prob engine runs but exhaust manifold cherry red thinking exhaust valves opening early. plugs ok engine not runing hot. prob started first sprint of the year. didn,t rev it past 8500 of the line then changed to second and stoped reving at 6000. now even on tick over 1800 exhaust cherry red

[marshalla]

What sort of ignition are you running ?

[jagracer]

Are sure it's not the ignition too retarded? Has this just started to happen or is it a new engine to you?

[jerseyvixen]

dizzy is aldon ignighter was runing 36 have retarded it back to 32 . engine a 18 months old end last year snapped cam engine rebuilt & dizzy did track day run ok then sprint then prob on first run . is possable to twist cam ? i am told rear to snap one

[marshalla]

36 ! 32 ! !?!?!?!?


what sort of cams do you have in that thing ?

[jerseyvixen]

. Application Power Band Power Increase Duration Valve Lift Timing Full Lift Lift @ TDC with clearance Valve Clearance

XFBP300 RALLY 3000‑8000

For use in well modified engines where serious power and 'thumping' mid range torque is required.

[jagracer]

jerseyvixen said:

dizzy is aldon ignighter was runing 36 have retarded it back to 32 . engine a 18 months old end last year snapped cam engine rebuilt & dizzy did track day run ok then sprint then prob on first run . is possable to twist cam ? i am told rear to snap one

By retarding the top end you will have retarded the bottom by the same amount unless it's programmable ignition so you could be burning the fuel in the manifold, why did you retard it?

[jerseyvixen]

good fuel a problem to get hold of. comprsion 11.7/1 retared to compensate for fuel

[jagracer]

jerseyvixen said:

good fuel a problem to get hold of. comprsion 11.7/1 retared to compensate for fuel

OK, I've had similar problems although mine is a Hemi head which is more prone to knock, I'm back to 30degress at 4.5K. I have one of the 123 ignitions that can be programmed. I would check the timing at tickover and say 2K to see what you have, I'd be looking at at least 10deg and 20 respectively although this wont solve the lack of max revs. One other question does it have a rev limiter, this could be faulty or suffering electrical interference, I had to ditch mine.

[Stig]

jerseyvixen said:

dizzy is aldon ignighter was runing 36 have retarded it back to 32 . engine a 18 months old end last year snapped cam engine rebuilt & dizzy did track day run ok then sprint then prob on first run . is possable to twist cam ? i am told rear to snap one

Did you rebuild using the same block? I snapped 2 cams in a 711M :-o and realised all was not well. New block sorted it.

[Pumaracing]

My spill chucker's just gone to Defcon 3. Something's definitely retarded but I'm not sure what