175whp

[Luis325]

Fern you suck.. Never should have sold the parts...

I guess its time for me to do my own itbs and continue this haha...

[Luis325]

^ lol he made 200whp.
Sold the m20 engine and installed a s52 with 265whp...
Now he is happy... For now... In a few weeks he will want more power...

[Alex Mc]

Just read this thread. Bump for updates?

[DooDanE30]

where can i buy those air ducts for my headlight?

[TheTacoMan]

Just read the thread. MO updates preez.

[2mAn]

this is way overdue for an update

[Luis325]

Lets go fern!! Dyno time!!!

[kamotors]

cant wait to see dyno results

[Fernflex]

#21 injectors, wasted spark and cam gear are installed, I have one of the seals leaking a bit of oil.

Maybe tonight I will go to the dyno, is not easy to schedule with the dyno, mechanic, tuner and me!

[Exodus_2pt0]

Bump for info.

[Fernflex]

Nothing yet, the idle is a litte high and we have to fix that also Im still waiting for the cam gear and the wasted spark.

[darvo]

Dyno Update?

[nando]

I've seen enough broken rockers on cars that I know spent little or no time at high rpm to have formed a theory as to the cause. I think that the primary culprit is a history of poor maintenance. Specifically a lack of timely valve adjustments. Excess clearance increases the impact force as the rocker meets the valve because the slope cam is slightly greater the more clearance there is. Worn valve guides may also be a contributor. Those repetitive impacts eventually cause failure.

Polishing the rockers around the failure zone helps because it removes stress risers. But going no more than 15k between valve adjustments is even more effective.

definitely a factor overall, but even if perfectly maintained, I wouldn't expect 25 year old used rockers to withstand a schrick 288 at 7300rpm for very long.

[jlevie]

I've seen enough broken rockers on cars that I know spent little or no time at high rpm to have formed a theory as to the cause. I think that the primary culprit is a history of poor maintenance. Specifically a lack of timely valve adjustments. Excess clearance increases the impact force as the rocker meets the valve because the slope cam is slightly greater the more clearance there is. Worn valve guides may also be a contributor. Those repetitive impacts eventually cause failure.

Polishing the rockers around the failure zone helps because it removes stress risers. But going no more than 15k between valve adjustments is even more effective.

[nando]

oh man, yeah, bone stock rockers, 288 cam, 7000+ rpm? it wasn't a matter of if it would fail, but when.

think of aluminum rockers as having some X number of cycles before they will break. Maybe it's 1,000,000 or 10,000,000, but when it gets close to that limit, it becomes increasingly likely it will break, even if you aren't racing it. after 25 years, most of those cycles will have been used up. And increasing the RPM just uses them up faster.