ECUtune Camshafts

[longassname]

Basically if you want to go forced induction and you have a high miles engine you need to rebuild it. Old SVX rings don't seal. Nobody knows how much new SVX rings can hold as the engines aren't commonly rebuilt yet (that will obviously start changing soon--we're in that age range that just about all svx engines are heavily worn.)

So far everyone who is doing anything as far as an engine rebuild is doing everything. We've all gone in for rods, pistons, and cam sets. If you are going to go forced induction that is what I would recomend.

Yes, cams and 2v7 are a good match. Expect serious performance from these cams--you will need 2v7.

Originally Posted by Nomad

ok , just to be sure that I understand how it works :

- We have to send our ( or some ) cams to have them rebuilt ? or something like that ?
- If we want to go Turbo , We need absolutely lower compression pistons ?
( du to autodetonation i suppose .. ? )
- And those cams are completely compatible with chip v2.7 ?

By the way , Its been 2 years that im here and , I just known that Micheal Emery is Longassname !!!! maaannnnnn still searching for 370cc injectors by the way !

[cdigerlando]

I'm not exactly sure where I saw this, but I thought you were running cam profiles from the 300 zx turbo. I'm assuming that it is the early to mid 90's cam. I think this was a really good choice. I reviewed the power band for this engine. peak torque at 3600 and peak HP at 6400 (close to the auto shift point). I'm sure you compensated for the difference between the flat engine and the 60 degree V engine. Also the 300 zx turbo ran 8.5:1 compression, which is what I also thought you were targeting for our compression. Just thought I would mention that, since there has not been a lot of discussion lately regarding the profile design. Can't wait to see it in practice.

see ya

[longassname]

I'm not sure where you saw that either. These cams are not the same profile as a 300zx tt cam. I've made mention of the fact that a 256 intake duration has repeatedly proven itself in the best performance street cams made for cars such as na supra's, turbo supras, z's, etc but none of those cars have a 256 intake duration factory.

I posted a plot of both the intake and exhaust profiles earlier in the thread. They are far from 17 year old stock nissan cam profiles.

Originally Posted by cdigerlando

I'm not exactly sure where I saw this, but I thought you were running cam profiles from the 300 zx turbo. I'm assuming that it is the early to mid 90's cam. I think this was a really good choice. I reviewed the power band for this engine. peak torque at 3600 and peak HP at 6400 (close to the auto shift point). I'm sure you compensated for the difference between the flat engine and the 60 degree V engine. Also the 300 zx turbo ran 8.5:1 compression, which is what I also thought you were targeting for our compression. Just thought I would mention that, since there has not been a lot of discussion lately regarding the profile design. Can't wait to see it in practice.

see ya

[longassname]

Pistons are done and on their way.

[TomsSVX]

Originally Posted by longassname

I'm not sure where you saw that either. These cams are not the same profile as a 300zx tt cam. I've made mention of the fact that a 256 intake duration has repeatedly proven itself in the best performance street cams made for cars such as na supra's, turbo supras, z's, etc but none of those cars have a 256 intake duration factory.

I posted a plot of both the intake and exhaust profiles earlier in the thread. They are far from 17 year old stock nissan cam profiles.

I think I had mentioned that we are running a profile similar to the Z32 cams but I didn't say we were using an exact match

Tom

[cdigerlando]

Originally Posted by longassname

Pistons are done and on their way.

How do they look? Compression?

[cdigerlando]

Originally Posted by TomsSVX

I think I had mentioned that we are running a profile similar to the Z32 cams but I didn't say we were using an exact match

Tom

Hopefully these cams peak simularly.

[SVXRide]

Originally Posted by TomsSVX

I think I had mentioned that we are running a profile similar to the Z32 cams but I didn't say we were using an exact match

Tom

yeah, there might be EG33 intake and exhaust cams out there that are similar
-Bill

[jman050]

cant wait to see some dyno #s

[longassname]

I don't think you bought a set; how are you going to dyno with them?

Originally Posted by jman050

cant wait to see some dyno #s

[longassname]

You guys do realize that z32's have variable intake valve timing, different size valves, and and different centers I hope?

In addition when looking at tt plots keep in mind that you're looking at wot which means boost which means you are to a large extent looking at the shape of the compressor's plot unless it's running into restrictions like we do on a stock svx engine.

If you really must compare our profiles to another profile to project how you expect them to work compare them to the stock svx cams. That said the best understanding can be had by looking at the plot of lift vs crank rotation. When you understand that you will know exactly how the cams will work and you won't need to make comparisons to other cars.

Originally Posted by SVXRide

yeah, there might be EG33 intake and exhaust cams out there that are similar
-Bill

[SVXRide]

Originally Posted by longassname

You guys do realize that z32's have variable intake valve timing, different size valves, and and different centers I hope?

In addition when looking at tt plots keep in mind that you're looking at wot which means boost which means you are to a large extent looking at the shape of the compressor's plot unless it's running into restrictions like we do on a stock svx engine.

If you really must compare our profiles to another profile to project how you expect them to work compare them to the stock svx cams. That said the best understanding can be had by looking at the plot of lift vs crank rotation. When you understand that you will know exactly how the cams will work and you won't need to make comparisons to other cars.

The TT profile was never in the mix...
-B

[longassname]

I was combining my response to Chuck with yours since you are both making similar mistakes.

It doesn't matter if you are using a tt profile or "something very similar." If you haven't laid your intake and exhaust profiles together according to crank rotation you don't understand how they are going to work.

Since I don't have the cnc data for your profiles I can't say for certain they are going to be an absolute dissaster but I do see reasons to expect less than great things from them. Specifically I think your overlap is going to occur at the wrong place. In most cars they don't worry about this too much because they can use adjustable sprockets to dial that in to where they want. They SVX is somewhat unique in that the intake cam is driven off of the exhaust cam by gears so the timing between the intake and exhaust cams can not be adjusted (excluding installing the cams miss aligned by a tooth which is crude and rough and probably won't do the job).

I really don't want to rain on your parade. I would just like to see you figure this stuff out with out the extra expense of another dyno session and having to pull your engine again to change cams. I know all too well how those expenses add up.

Originally Posted by SVXRide

The TT profile was never in the mix...
-B

[SVXRide]

Originally Posted by longassname

I was combining my response to Chuck with yours since you are both making similar mistakes.

It doesn't matter if you are using a tt profile or "something very similar." If you haven't laid your intake and exhaust profiles together according to crank rotation you don't understand how they are going to work.

Since I don't have the cnc data for your profiles I can't say for certain they are going to be an absolute dissaster but I do see reasons to expect less than great things from them. Specifically I think your overlap is going to occur at the wrong place. In most cars they don't worry about this too much because they can use adjustable sprockets to dial that in to where they want. They SVX is somewhat unique in that the intake cam is driven off of the exhaust cam by gears so the timing between the intake and exhaust cams can not be adjusted (excluding installing the cams miss aligned by a tooth which is crude and rough and probably won't do the job).

I really don't want to rain on your parade. I would just like to see you figure this stuff out with out the extra expense of another dyno session and having to pull your engine again to change cams. I know all too well how those expenses add up.

Michael,
I've got the plots that you're refering to. They look very similar to yours, just lacking the more "modern" top of the lobe.
-Bill

[longassname]

That's not even possible. Your 1mm durations are about 30 degrees less than mine. I'd expect your overlap to occur about 4 degrees off center and at a virtually non existant lift.

Originally Posted by SVXRide

Michael,
I've got the plots that you're refering to. They look very similar to yours, just lacking the more "modern" top of the lobe.
-Bill