All Things Mk5 > Mk5 General Area
Timing chain replacement question
breeze:
What is the mileage on your car and could the job have been mis timed before?
Let us know how you get on.
skkane:
Yes, I think the previous owner mistimed it. Don't think it jumped off on its own. I heard it's easy to mess up if you don't have that alignment tool / bridge thing to check. It should screw in perfectly for a job well done.
I'll report back tonight.
pudding:
--- Quote from: skkane on January 22, 2023, 10:49:41 pm ---Yeah that adjuster thing is really expensive. Hopefully it will work fine with the new solenoid and timing set correctly.
Managed to find some $ to get the belt done also, ordered a new kit with waterpump and rollers, getting that done in the morning.
Anyone knows how much hp you lose per degree of timing wrong? I read it’s like 2-4hp / degree… on a ls1 forum. So I would be off by ~50hp with -18 degrees.
Can’t wait to dyno it again after all is fixed properly :laugh:
--- End quote ---
Interesting theory, never heard of that before, but it does sound like American forum stuff :grin: So if your intake cam is one tooth off, that's 19 degrees at the cam end, but as the cams run at half crank speed, it's probably ony 9 degrees in reality, in terms of crank - cam correlation. So the yanks reckon your engine should be down 18hp then, but that still puts it way under where Stage 2 should be, so yeah, they can keep that stupid theory :grin:
skkane:
Bad news. Car still runs like crap, same 10 degrees. Most likely not set right again, will retry it and 2nd time lucky hopefully. BTW, I have no idea why group 93 shows nothing...
LC5F:
It's a dark art! - I tied myself in knots getting mine right - at one point I was out at both crank and chain, but in my defence, I had no benchmark of existing timing marks to start
Doesn't help that in a correctly timed state the belt top & bottom marks don't line up 100%
IIRC no value in 93 is too far out
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