7MGTE VALVE SPRING ALTERNATIVES
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Supramania Contributor
The only place where the Comp Cams springs were "Tight" is in the head spring seat.
The buckets are not loose, but they slip right over the springs just fine. At the bottem of the spring cutout, there is a seat, and it tapers down slightly. This is where the comp cams springs do not just drop in like the stocker, but the first coil does fit without any machine work. Just install the lifter, and it seats the spring flat.
I was concerned when I first tried these springs that it would cause a friction problem, but it does not. After you install a spring, if you want, remove the locks and the lifter and notice the spring just needs a gentle tug to be removed. The last coil is the only thing touching the bore of the spring/lifter bore. I figure the last coil does not move much, and the soft aluminum will not cause any problems on a harder steel spring over time. The spring might wear the sides of the bore where it touches, but who cares? It is like the last 1mm of bore that touches the spring. Nothing more. Very little movement in that last 1mm.
We looked at re-sizing the bores/seats and using 2JZ springs, buckets and valves to get better springs. Also the slightly longer 2JZ valve stem would allow a custom grind on 7M cams with more lift/duration just by reducing the base circle, but leaving all the stock lobe... Ended up not going that route, too much work, and not much material to work with really. the bore walls would be very thin in places, and some coolant passeges would be close too.
So, back on topic. The Comp Cam's 975-12 x 2 is what you want to order. Then enjoy NEW springs, the latest metalurgy, and higher seat and open pressures, but not so high they cause wear isssues/problems.
Why spend nearly 100.00 on new OEM springs, or more on "Aftermarket" springs from Japan when you can put these in for about 70.00?
I don't think they are louder either.
My engine is so loud it's like driving a diesel around at times. (Piston slap, and the longer stroke, it just sounds different than every other 7MGTE out there.)
The buckets are not loose, but they slip right over the springs just fine. At the bottem of the spring cutout, there is a seat, and it tapers down slightly. This is where the comp cams springs do not just drop in like the stocker, but the first coil does fit without any machine work. Just install the lifter, and it seats the spring flat.
I was concerned when I first tried these springs that it would cause a friction problem, but it does not. After you install a spring, if you want, remove the locks and the lifter and notice the spring just needs a gentle tug to be removed. The last coil is the only thing touching the bore of the spring/lifter bore. I figure the last coil does not move much, and the soft aluminum will not cause any problems on a harder steel spring over time. The spring might wear the sides of the bore where it touches, but who cares? It is like the last 1mm of bore that touches the spring. Nothing more. Very little movement in that last 1mm.
We looked at re-sizing the bores/seats and using 2JZ springs, buckets and valves to get better springs. Also the slightly longer 2JZ valve stem would allow a custom grind on 7M cams with more lift/duration just by reducing the base circle, but leaving all the stock lobe... Ended up not going that route, too much work, and not much material to work with really. the bore walls would be very thin in places, and some coolant passeges would be close too.
So, back on topic. The Comp Cam's 975-12 x 2 is what you want to order. Then enjoy NEW springs, the latest metalurgy, and higher seat and open pressures, but not so high they cause wear isssues/problems.
Why spend nearly 100.00 on new OEM springs, or more on "Aftermarket" springs from Japan when you can put these in for about 70.00?
I don't think they are louder either.
My engine is so loud it's like driving a diesel around at times. (Piston slap, and the longer stroke, it just sounds different than every other 7MGTE out there.)
yep, machine shop bitched about putting mine in... I told them they fit and stop arguing with me LOL
Ordered them yesterday. $83.00 shipped. Also ordered my stage 2 Brian Crower cams. Thanks guys for all your input. Everyone wants me to swap to a JZ series motor, but like any motor, if you build it the right way,it will live.
racerpage said:
good man....just wave good bye to that torqueless bandwagon!!!
id pick up a set but im eventually going to get a MS&S and run to 7500, dont know if those chevy parts can handle that type of thing.....
those spring probably will handle it, or probably will be better off going with a set of ferra(?) springs???
I run stock springs with a TODA inner-shim kit on my NA 7M,
and repeatedly run past 8500, with no problems.
The TODA inner-shim set-up is about 1/3rd less weight than the stock followers.
TODA springs are about 10% stiffer, but not having boost pressure acting against the intake valve, why waste the HP to push stronger springs down?
When the engine was dead stock, I would rev it to 8000.......
No float, no breakage problems.
I am just building another head with larger Ferrea valves, and most likely will stick with inner shims, if I can gather all the pieces together.
TODA-USA refuses to stock 7M parts, and have actually turned me down on custom ordering any.......
So I buy out of Japan.
and repeatedly run past 8500, with no problems.
The TODA inner-shim set-up is about 1/3rd less weight than the stock followers.
TODA springs are about 10% stiffer, but not having boost pressure acting against the intake valve, why waste the HP to push stronger springs down?
When the engine was dead stock, I would rev it to 8000.......
No float, no breakage problems.
I am just building another head with larger Ferrea valves, and most likely will stick with inner shims, if I can gather all the pieces together.
TODA-USA refuses to stock 7M parts, and have actually turned me down on custom ordering any.......
So I buy out of Japan.
hey guys, sorry to dig up an old thread, but i got pretty excited when i found out you can get the comp. inners from JEGS!:icon_surp JEGS has always been good to me and i figured it would be convenient.
http://www.jegs.com/i/Comp+Cams/249/975-12/10002/-1/747023%7C10699
http://www.jegs.com/i/Comp+Cams/249/975-12/10002/-1/747023%7C10699
TheNewRed;1105223 said:
jegs
summitracing
any place that sells and specialize in american motors will sell those compcam springs....
Yep JEGS is where I ordered mine from. Summitracing, had only 1 set in stock at the time I was ordering them.
This is the first time I have read this thread and reading what Rich said:
I am thinking GOD DAM IT MOTHER FUCKER!! I am using BC stage 3 cams with my comp. springs. I wish Rich would have told me this before I order my cams from him. I even told him I was going with comp springs. So after a $7000 rebuilt I "could" brake a spring from coil bind and fubar up the whole engine now.:cry:. All this over what, $200 differance between springs.:nono:
This is the first time I have read this thread and reading what Rich said:
suprarich;777763 said:
I am thinking GOD DAM IT MOTHER FUCKER!! I am using BC stage 3 cams with my comp. springs.
I wish Rich would have told me this before I order my cams from him. I even told him I was going with comp springs. So after a $7000 rebuilt I "could" brake a spring from coil bind and fubar up the whole engine now.:cry:. All this over what, $200 differance between springs.:nono:
92nsx;1105506 said:Yep JEGS is where I ordered mine from. Summitracing, had only 1 set in stock at the time I was ordering them.
This is the first time I have read this thread and reading what Rich said:
I am thinking GOD DAM IT MOTHER FUCKER!! I am using BC stage 3 cams with my comp. springs.
Why dont you just get the BC springs?
I wonder if you could just get the inners from BC and i wonder if they would fit inside the comp springs..
RedEj8;1105624 said:
To tell you the truth I didn't know they made/had them. I should have since I bought there cams and oversized valves. I thought there were like only a few companies made them for our old engines. Toda??, Ferrea and comp cam springs, I thought were my options.
After a little search I see this
jdub;931165 said:Here's the spring seat pressures for the various ones available:
Stock - 35 lbs
Comp Cams - 55 lbs
BC - 60 lbs
Ferrea - 67 lbs (dual spring)
Becomes a factor with more agressive cams and/or higher rpm (8K +) levels. The Comp springs are the best bang for the buck if you're running stock engine rpm IMO. And you can use the stock retainer, no problem.
Couple days ago
Well I am NOT going to spin this 7m much past 7k ever. I Guess I will just hope for the best.
92nsx;1105506 said:Yep JEGS is where I ordered mine from. Summitracing, had only 1 set in stock at the time I was ordering them.
This is the first time I have read this thread and reading what Rich said:
I am thinking GOD DAM IT MOTHER FUCKER!! I am using BC stage 3 cams with my comp. springs.
You will be fine on stage 3 BC cams with near stock redline. You still have room left even if it compresses to 90%. You won't coil bind.
ok sorry to bring up this old thread from the dead, Im in the process of gettin the head work done for my build and i was wondering about the whole bbc valve spring thing this is the link from a couple pages back from jegs
http://www.jegs.com/i/Comp+Cams/249/975-12/10002/-1
so my question is would i need just two sets of these or a set of these and something else for now i am running stock ge cams and converting to a turbo (cams are a bit out of price range right now)
thanks guys for any help you can give me
http://www.jegs.com/i/Comp+Cams/249/975-12/10002/-1
so my question is would i need just two sets of these or a set of these and something else for now i am running stock ge cams and converting to a turbo (cams are a bit out of price range right now)
thanks guys for any help you can give me
You need two sets (24 springs)...they will work great with stock turbo cams.
PM Suprarich, pretty sure his price is a bit better than Jeg's.
PM Suprarich, pretty sure his price is a bit better than Jeg's.