I havent posted on here much but I usually come here and search around when I need my questions answered.(Thank you for the G23 threads)

I'm in the process of a turbo H22a1 build and I want to know if there is a difference between the H22a cams and the a1 cams, and which set would be better for boost, if they are different. I pry missed the info somewhere, so a link would be enough to help out if you have one.

I also considered crower turbo cams, but I dont have the cash flow for those as I still need a manifold and turbo. I'm still trying to decide on love-fab or SLS on the manifold and I have my heart set on buyin a new HX35/40 for the turbo. The engine is sleeved/forged/ported with valvetrain.

 

just use whatever you currently have. I'm making 470whp on stock usdm h22a4 cams

 

^^ like he mentioned. h22a cams are great for power. people can go past 500hp even. On my turbo build I would personally spend the extra $$ elsewhere.

 

Thanks for the replies, I have 2 spare H22a engines sitting in the garage along with the a1 that I'm building thats why I was wondering if there was a difference between the two. It wouldnt cost me anything to switch to the JDM cams if they would be better, even for only a few HP.

 

h22a cams=h22a1 cams=h22a4 cams
least as far as lobe heights go, i have measured all 3 back to back.

 

Thank you, that helps.

 

unless your are switching to turbo cams, keep the stock ones. overlap is what you have to watch for when boosting. like mentioned before, spend the money on something else.

 

PM'd

 

Yeah I know gregbb1 is making 530 whp on stock cams as well, and also as a note, the lovefab manifold! I always understood that the jdm h22a cams were slightly more aggressive than an h22a1 or a4, but not so much as the type-s cams. So personally if you have all these sets available, why not at least use the jdm cams.

 

I finally found what I was looking for on brian crowers site:

USDM H22A1 (’94-’96) Stock 288°/308° 231°/234° .448"/.415" 11.38/10.54

JDM H22 (’92-’96) Stock 296°/300° 232°/228° .456"/.420" 11.58/10.67

JDM H22A (Type S) Stock 306°/310° 230°/230° .469"/.438" 11.91/11.12

http://www.briancrower.com/mak...shtml

as it turns out the JDM cams are a bit hotter.

 

the stack of cams sitting here that have all been measured with micrometers and all that good stuff are all the same. Did not matter if it was a JDM engine (of which i have 3 diff sets, 1 5 spd jdm lude, 1 5 spd jdm accord and one auto lude) as well as an h22a4 head that cams came out of, and then a pair of supposed type-s cams i bought. Out of ten cams only one had slightly larger vtec lobes, and that was the exhaust cam from the "type-s" set.
I cannot speak for duration since i do not have the means of measuring it, but I trust my measurements more than anything posted on the net.