[93civEJ1]

Just something I was thinking about a second ago. How possible is it with the timing belt off for valves to open far enough to be able to touch each other? Is it possible with stock cams? with any HKS cam? etc?

 

[Vu]

I believe only after 272 cams does the 2J become an interference motor.

 

[Tampa mike]

with large cams with a fair amount of duration and overlap and adjustable cam gears its very possible.

I just started using a cam degree fixture wheel for some of our motors that up until a short bit ago werent available. I have seen some great improvements on the honda motors we do, especially turbo cars, and understanding exactly where to place the exhaust cam and how it affects actually helping pull the exhaust gas out with a negative pressure

 

[FastTurbo]

Our motors become interference when an bone stock motor thats never been decked/machined has cams with 10mm of lift or greater.

HKS 280 cams on an untouched motor will not be interference. Some of the bigger custom grinds Crower/BC/GSC/Crane will have some cams with a lift of 10mm or greater.

If your head has been decked or block planed the clearances between the head and block have changed and it will take a smaller lift cam to now become interference.

You should however make a habit of installing ANY cam interference or not as IF they were interference. That way you will put your worries at rest.


-Matt

 

[93civEJ1]

well im not really talking about valves hitting pistons here...I am talking about valve to valve contact. Not even worried about the block area.

 

[FastTurbo]

well im not really talking about valves hitting pistons here...I am talking about valve to valve contact. Not even worried about the block area.

I doubt it, but i'm hoping you installed them per the fsm.