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Drop In Cams For R32 Gtr

khezz

By khezz,
in Engines & Forced Induction

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khezz Rising Star

khezz

Posted
Posted

Hi all

I am about to upgrade my camshafts. I was looking at the HKS 272/10.20 on both sides. I am getting conflicting evidance about the drop in ability of these cams.

I am being told that as long as they are no more than 272 duration and less the 10.25mm lift i am ok. is this true?

I am also looking at definetly fitting HKS springs to match.

Also looking at getting tomei bronze guides and JUN titanium retainers. Good idea to change the olds gear anyways.

Are those parts drop in?

any help is very welcome.

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Adriano Grand Master

Adriano

Posted
Posted

With cams of that size, you really want upgraded springs, and with the sort of power you would want to be producing to want cams that large you really need a built motor, so not really a drop in prospect,. If you want cams to drop into a stock internal motor, i would be looking at some poncams, or hks 256/264's

saliya Rising Star

saliya

Posted
Posted
Hi all

I am about to upgrade my camshafts. I was looking at the HKS 272/10.20 on both sides. I am getting conflicting evidance about the drop in ability of these cams.

I am being told that as long as they are no more than 272 duration and less the 10.25mm lift i am ok. is this true?

I am also looking at definetly fitting HKS springs to match.

Also looking at getting tomei bronze guides and JUN titanium retainers. Good idea to change the olds gear anyways.

Are those parts drop in?

any help is very welcome.

If by 'drop-in' you mean 'will fit without clearancing' I don't think so. Pretty sure they have

the std. base circle and my understanding is that anything with std. base circle and over

9.5mm lift requires clearancing for the lobes.

I'm currently having the same HKS 10.2mm cams installed and the head is currently off

being clearanced. I didn't personally check whether they'd rotate; but I'm presuming that

the engine builder's not doing unnecessary work :D

If you go for something with a smaller base circle and the same lift you might get away without

head work but you will need different lifters; you might find that the price of those may well

offset the cost of the head work (if you buy a named Japanese brand) ...

Regards,

Saliya

rev210 Grand Master

rev210

Posted
Posted (edited)

9.15mm of lift is pretty much the limit. It's not hard to remove the extra material for lobe clearence if you are careful however.

Those HKS units are really suited to higher rpm use, as people have suggested extra beefing up of the valve train will be need in terms of springs etc.

You are rebuilding the motor? I think you will want to if those cams are matched to the right turbo hardware, you are talking decent rpm and power and an old R32 engine is not going to live for a very long time.

There really isn't any 'true' drop in cam for the Rb26 engine given you are talking solid lifters that need shims to get clearences where they need to be. Expect to fork out money for shims and you won't be dissapointed either way. The most luck people have had is with Tomei units in terms of not having to buy the odd shim, and when I say luck thats what I mean.

Hope that helps

Edited by rev210
heller44 Mentor

heller44

Posted
Posted
...There really isn't any 'true' drop in cam for the Rb26 engine given you are talking solid lifters that need shims to get clearences where they need to be. Expect to fork out money for shims and you won't be dissapointed either way. The most luck people have had is with Tomei units in terms of not having to buy the odd shim, and when I say luck thats what I mean.

Hope that helps

Just out of curiosity, how much do shims usually cost?

james.

khezz Rising Star

khezz

Posted
  • Author
Posted

thank guys. At this point in time the bottom end is stock (than agin with the test that have been done no one can realy be sure, some strange results). I am not looking for high rpm. I am looking at getting as much lift as possible. if i can get a cam with about 10mm lift and under 270 duration, that would be great. I am going to get springs either way. also want to get new guides and retainers. powers wise I am not looking any more than 500hp @ wheels. thats more than enough for alot of fun in these cars (well for me anyways). I will be building a motor in the next few months but for now I am slowly buying all the gear for that. Right now I have funds available for the work i described above and carilo rods (damn they cost alot).

so can you drop in guides and retainers to?

rev210 Grand Master

rev210

Posted
Posted

my 2c.

Leave the top end alone till you are ready for the full rebuild at least you don't have the risk of wrecking things you could otherwise use if you are leaning on the stock bottom end with anything more than 370rwhp, forget 500rwhp thats a hand grenade. If it's only a few months away save the money till then.

khezz Rising Star

khezz

Posted
  • Author
Posted

fair enought. thanks guys. so you reckon the bottom end is only save for about 370hp at the wheels. i keep getting figures of 400 to 430hp oh well i guess imports realy are a black art. thanks again for the info.

rev210 Grand Master

rev210

Posted
Posted
fair enought. thanks guys. so you reckon the bottom end is only save for about 370hp at the wheels. i keep getting figures of 400 to 430hp oh well i guess imports realy are a black art. thanks again for the info.

You 'can' run those sort of power figures on a stock Rb26 but, on higher km ones it shortens the life of them very rapidly, they ultimately fail because the motors weren't put together to live at that sort of power level.Although there are plenty of people to tell you otherwise (a few friends are running over 400), better safe than sorry.

noone Experienced

noone

Posted
Posted

With the tomei poncams is this sorta effort needed ie new springs, retainers, guides etc what about the bolts for the cam bearing holders?(not sure what you actually callem) are they like headbolts and need too be replaced, have been wondering especially about the springs this seemed like a good thread to ask in, sorry for the hijack.

700HP-GTR33 Mentor

700HP-GTR33

Posted
Posted
9.15mm of lift is pretty much the limit. It's not hard to remove the extra material for lobe clearence if you are careful however.

Those HKS units are really suited to higher rpm use, as people have suggested extra beefing up of the valve train will be need in terms of springs etc.

You are rebuilding the motor? I think you will want to if those cams are matched to the right turbo hardware, you are talking decent rpm and power and an old R32 engine is not going to live for a very long time.

There really isn't any 'true' drop in cam for the Rb26 engine given you are talking solid lifters that need shims to get clearences where they need to be. Expect to fork out money for shims and you won't be dissapointed either way. The most luck people have had is with Tomei units in terms of not having to buy the odd shim, and when I say luck thats what I mean.

Hope that helps

Oh...yes......bastard shims....lol

I think I had to replace 18..

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Why look for high RPM if you dont need it? Or have the motor capable of running added RPM?

I dont see the point to be honest.

Better off with cams better suited and a more reliable target (on a stock bottom end)

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