Cam timing on Dyno

[fika84]

Originally Posted by secho

Hello there,
just found this thread most appropriate. Maybe somebody can help guys.

After rebuilding FA20 engine I have got issue with the intake cam avcs angles. It fires P000A and P000C (slow response to avcs command).
Engine setup is:
Cosworth supercharger
OEM crankshaft
pCoteMax Kings main and rod bearings
Bridgeway forged rods
JP pistons CR12.5 86mm
machined heads and block
DW 450cc PI
baffled sump plate
CUSCO water oil cooler
mishimoto thermostat (the one which comes with the supercharger kit)




I think about several reasons:

*


- bad one or both OCV selenoids ( less probable, because before disassembly of the engine, cams worked ok, I checked the previous logs)*

- incorrectly aligned timing chain (less probable, because engine goes more-less ok)
*
Can I ask you for your opinion please? Check the logs bellow.


——————
*
intake cams
*
• there is rapid oscilation of both cams all the time
• none of the cam goes over 20FR deg
• cam 1 is performing better than cam 2
*
https://datazap.me/u/secho/loguju-va...mark=9166-9354
*
——————
intake cams angle ugly oscillation
*
https://datazap.me/u/secho/loguju-va...zoom=5408-5893


------------
exhaust cams*
*
• actual angles fluctuates much more when the oil temperature is low (one cam more then the other)
• fluctuation stabilises when the oil temperature rise (both cams ok)
• it follows target exhaust angles*
*
https://datazap.me/u/secho/loguju-va...mark=1384-8114
*

Please let me/us know what you find with this. My intake cams are doing the same thing after engine rebuild and I'm about to take the engine back out to clean the cam gears more thoroughly!

[secho]

Originally Posted by fika84

Please let me/us know what you find with this. My intake cams are doing the same thing after engine rebuild and I'm about to take the engine back out to clean the cam gears more thoroughly!

Finally I ended up changing all 4 cam gears for new parts. The most expensive way. But now it works flawless.

[fika84]

Originally Posted by secho

Finally I ended up changing all 4 cam gears for new parts. The most expensive way. But now it works flawless.

Sounds like the path I'm headed down.. I've concluded that it's not electrical by moving around sensors, solenoids and changing tunes. It has to be oil passage related.

Thanks for that info!

[secho]

Originally Posted by fika84

Sounds like the path I'm headed down.. I've concluded that it's not electrical by moving around sensors, solenoids and changing tunes. It has to be oil passage related.



Thanks for that info!

While rebuilding engine, did you removed cam timing oil control valve filter in the heads sub-assy? They could get clogged. See the pic.

Odesláno z mého SM-G973F pomocí Tapatalk

[fika84]

Originally Posted by secho

While rebuilding engine, did you removed cam timing oil control valve filter in the heads sub-assy? They could get clogged. See the pic.

Odesláno z mého SM-G973F pomocí Tapatalk

Oh yeah, I ripped those bitches out!