Hey guys,
I was wondering if anyone in here have experience on building a cammed m20 that passes emission idle test.
My M20 has Schrick 288' cam with Metric Mechanic parts (coated rod bearings, head bolts, head gasket, rocker arms, valve springs & retainers) which was originally built for a racecar, but I've been using it on my street car for few years.
Up until last year I could get a conditional pass by failing emission test twice with a proof that 'repair' bill would be more than $500.
As of last year the Ontario government won't issue two conditional passes in a row. So that leaves me with 2 years to change my engine so that it'll pass emission.
Right now it gets about 1800 ppm HC in idle (test limit is 200ppm) - so changing spark plug gaps, cat or idle speed to at HC isn't going to help much to get it down to 200ppm.
So I'm planning to swap out the cam to either stock or something milder, and do a top-end work while I'm in there. I like the idea of hotter cam but I was wondering if anyone have experience building a cammed m20 that's mild enough to pass the emission. Looks like aftermarket 'street' cam is 272, which sounds pretty aggressive in terms of emission, and I couldn't find anything less aggressive (Alpina cams) on the market yet.
I was wondering if anyone in here have experience on building a cammed m20 that passes emission idle test.
My M20 has Schrick 288' cam with Metric Mechanic parts (coated rod bearings, head bolts, head gasket, rocker arms, valve springs & retainers) which was originally built for a racecar, but I've been using it on my street car for few years.
Up until last year I could get a conditional pass by failing emission test twice with a proof that 'repair' bill would be more than $500.
As of last year the Ontario government won't issue two conditional passes in a row. So that leaves me with 2 years to change my engine so that it'll pass emission.
Right now it gets about 1800 ppm HC in idle (test limit is 200ppm) - so changing spark plug gaps, cat or idle speed to at HC isn't going to help much to get it down to 200ppm.
So I'm planning to swap out the cam to either stock or something milder, and do a top-end work while I'm in there. I like the idea of hotter cam but I was wondering if anyone have experience building a cammed m20 that's mild enough to pass the emission. Looks like aftermarket 'street' cam is 272, which sounds pretty aggressive in terms of emission, and I couldn't find anything less aggressive (Alpina cams) on the market yet.
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