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 Post subject: Mk1 cam timing/degrees
PostPosted: Mon Nov 13, 2017 4:07 pm 
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Joined: Fri Jun 13, 2008 12:48 am
Posts: 2
Location: Oulu, Finland
Hi.

I have mk1 gti engine in Suzuki Sj410 (Samurais predecessor).

Had problems with bad idle and seems like the cause was badly grinded camshafts(made in Sweden =) ).
That lead me measuring stock cams and results raised a question:
Are mk1 and mk2 cams and timing identical?

According to Catcams.com http://www.catcams.com/products/camshaf ... UP_id=1421
Intake valve should be open 0.5mm @tdc and exhaust 0.7@tdc.
My measurements show that my cam timing is late, intake -8degrees and exhaust -6degrees, with new belt and crankshaft key is ok.

Has anyone else measured stock cams, timing and is there any other explanation than manufacturing tolerances?

And top of this, i just noticed that catcams.co.uk has different specs for stock timing and cams...
http://www.catcams.co.uk/acatalog/Suzuk ... L_16v.html

I was planning to advance both cams ~4degrees but the question is where is the starting point :shock:


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PostPosted: Tue Nov 14, 2017 9:31 am 
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Joined: Sun Feb 23, 2003 4:16 am
Posts: 8042
Location: Ontario, Canada
Quote:
Are mk1 and mk2 cams and timing identical?


Yes.

Try measuring the timing with the intake centerline method. You should be at about 106 degrees on the intake cam. You can also use the E setting for the intake cam to advance by 4 degrees to re-check your phasing and see if it's closer to where you think it should be

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