I just ordered a Jun 3 cam complete with springs, TI retainers and the cam gears. It might take two weeks for delivery. I was planning on getting CTR pistons for it but still undecided. I did the calculation for the loss in dynamic compression and it seems to fall slightly below the stock no. The tuner who sold me the Jun cams said he tuned an ITR JDM with stock compression and he got 225 crank hp. He said that Jun will email him the correct cam adjustment specs. He does'nt use the degrees indicators in the cam gears but uses a dial guage to determine TDC and adjust the cams accordingly. I don't know if it makes sense because I am not a mechanic. He told me stock compression would be good enough.

But while I was going thru the Jun catalog, I noticed a section wherein they sell engine packages like stage 1 to 4. The stage 1 package puts out 225 hp(probably crank hp) but what caught my attention is that compression was at 12:1! It now seems that I have to go for CTR pistons. The tuner said that the Jun 3 cam will have a slightly lumpy idle when it is set properly. But when searching thru this forum, almost everybody says idle is very stable and just like stock. Is the tuner correct that stock compression with the cam set right will yield good whp nos? Any inputs will be highly appreciated. I will be using chrome to tune my JDM ITR.

I

 

def run 12 to 1 cr... get hte most out of the cams..

 

The more compression you can squeeze out of the motor, the more you will benefit from the cams. I have yet to see a Jun 3 with a lumpy idle, I was always told that they have near stock(type r) primaries. They are not known for a fatty midrange either, so for them to have a lumpy idle doesn't make sense. Just make sure that when you torque the cam gears onto the cams that you are precise, I've seen/heard of many Jun cams breaking at the end where the cam gear attatches. What I wanna know is why he said this:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by camlob &raquo;</TD></TR><TR><TD CLASS="quote"> He does'nt use the degrees indicators in the cam gears but uses a dial guage to determine TDC and adjust the cams accordingly. </TD></TR></TABLE>

Are the Jun cam gears not accurate or what? Cuz I have a set and would really like to know if they are accurate or not.

 

I was baffled when the tuner told me too about not using the indicators in the cam gears. But he said thats what the head honcho in Jun Japan said. They will first ask me what is the purpose of the car i.e. drag or circuit racing, then they will email the specs. I don't know what exactly they will instruct my tuner to do. But what I gather from the tuner/dealer in Singapore is that he uses a dial guage to get TDC and then adjusts the cam looking at the lobe. Dude, I could not fully grasp what he meant so I just kept quiet. But I asked him after he did the adjustments, how many degrees did the indicators show in the cam gears. I asked him if it was around 3 degrees advanced on the intake side and retard 1 degree in the exhaust, he said that sounded pretty much the general ballpark figure.

He said that when you try and have the car idle smoothly you are basically not using the correct specs for the cam. He said the car should idle a litlle lumpy. But looking at the primary lobe specs, it looks pretty much mild. So I am not sure what he meant.

I want to see the email from him with the instructions from Jun to clear up my mind!


Modified by camlob at 1:31 AM 5/5/2006

 

i think your tuner was describing a crude way of degreeing the cams in

 

my jun 3's purr like a kitten. 0, 0,

 

i'd love to see a 200whp b18c stock piston, unported head. . dynoed in manila. good luck.

(wala pa nakakagawa nun sa autoplus)

 

I to have a lot of experience with thes cams (probably my favorite of all time) never once have I ha d a non-stock idle with them.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1600cc &raquo;</TD></TR><TR><TD CLASS="quote">i'd love to see a 200whp b18c stock piston, unported head. . dynoed in manila. good luck.

(wala pa nakakagawa nun sa autoplus)</TD></TR></TABLE>

LOL!

wattup my filipino brothers... kamusta ka na?