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No Compression After Poncam Install

robbo_rb180
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robbo_rb180 Grand Master

robbo_rb180

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found out what it was when i removed the cam cover's....... i had the inlet 180 degrees out :)

i had taken the inlet cam vct stuff apart and not re-aligned it properly.

all fixed now

The Dan Grand Master

The Dan

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Nope, 180 degrees out will not bend valves.....it's just like working the engine in reverse.

You are very lucky.

Buying decent cam gears is a start...only the cheap shitty ones come with two marks....oh and the HKS ones...but once again, shitty.

robbo_rb180 Grand Master

robbo_rb180

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  • Author
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Nope, 180 degrees out will not bend valves.....it's just like working the engine in reverse.

You are very lucky.

Buying decent cam gears is a start...only the cheap shitty ones come with two marks....oh and the HKS ones...but once again, shitty.

i still have std cam gears.

i had it so both in & ex would open at the same time.

next time i will read a workshop manual, instead of just jumping into it.

The Dan Grand Master

The Dan

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Posted
i still have std cam gears.

i had it so both in & ex would open at the same time.

next time i will read a workshop manual, instead of just jumping into it.

wtf?

That would not be 180 degrees out. That's more like 60 degrees out. You are damn lucky!!!!!

Precisely why ppl should not attempt major repairs at home unless they have someone who knows what they are doing with them. Think about how many dollars you would have saved if the pistons collected the valves

PM-R33 Grand Master

PM-R33

Posted
Posted (edited)

My understanding of what happened (and i could be wrong) was that the VCT cam gear was completely pulled apart, then when put back together it was done incorrectly which moved the position of the TDC mark. Then it was put onto the intake camshaft, all TDC were marked up correctly and the belt was put on. So it appeared the belt was on correctly, when looking at the TDC dots, but in fact the VCT cam gear was wrong.

Is that right? Because other than that explanation I don't understand how you can do it incorrectly, the cam gears can only be placed onto the camshaft one way and the dots can only align up one way.

Edited by PM-R33
jiffo Mentor

jiffo

Posted
Posted

Yes the stock inlet cam wheel is adjustable, but from the back so it's a bit of a mission.

Sounds like someone was attempting to adjust the inlet wheel and then didn't re-assemble it all correctly.

Then the normal timing marks would all look to be OK, but the wheel would be referenced wrongly to the cam.

Good way to do some damage.

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