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Old 08-03-2006, 08:52 PM   #1
verc
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03 wrx
gt35r, 2.5L, meth

Default If you have Helix cams/valvetrain, read/reply in this thread

*edit*

I'll clarify on the exact nature of the problem:

- slight hesitation around 2500-3000 rpm
- periodically pulls timing. eventually goes into limp mode
- cyclical problem: car is fine for a week, then for week 2 pulls timing, goes into limp mode, week 3 car is fine again

*edit*


I know of two bugeyes w/ the Helix valvetrain experiencing wierd periodic power loss problems, going into limp mode. There is suspicion that they are wiping due to manufacturing issues w/ the lobes. However I've seen people using the cams and haven't heard issues.

Anyhow, post here if you have the Helix product. What car do you have, have you experienced problems, and do you have the whole valvetrain or just the cams?

Thanks,
Ambert
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Last edited by verc; 08-04-2006 at 08:30 PM.
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Old 08-04-2006, 10:16 AM   #2
mokujin22
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Default

Well, I'm having Gruppe-S put the 264 valvetrain into my 2.0L heads for a 2.5 hybrid. Hopefully, will get the assembled SB in the next couple of weeks.

What do you mean by "wiping?"

Tony
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Old 08-04-2006, 10:55 AM   #3
Drink
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Are there alot of people just dropping the 264s in without doing the springs, retainers, etc?
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Old 08-04-2006, 11:49 AM   #4
wrxfactor
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6spd, EJ255, VF39 & EWG

Default

Quote:
Originally Posted by mokujin22
Well, I'm having Gruppe-S put the 264 valvetrain into my 2.0L heads for a 2.5 hybrid. Hopefully, will get the assembled SB in the next couple of weeks.

What do you mean by "wiping?"

Tony
Tony,

Check the build date on your WRX, I've been reading on here that the early 02s had smaller ports in teh heads than later WRXs, even the later 02s and 03s. If your heads are already off and this is the case, you might as well port them. You don't wanna have that bad boy assembled and then see that the valvetrain is doing its job but the port sizes are screwing you.

Chris
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Old 08-04-2006, 04:36 PM   #5
WhiteWoRX1
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I have the cams and valvetrain installed, but have yet to put the motor in the car and fire it up. The only problem I have had so far is that the cams did not "drop in" as advertised. The thrust journals on all 4 cams were too wide and were binding in the head. I had to have them machined to fit.

I called Geoff at Gruppe-s to ask about this and he told me that he had only heard of one other customer that reported clearance issues with the cams. I talked to a couple of guys on here before buying the cams and they had yet to have any problems.
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Old 08-04-2006, 07:03 PM   #6
testes1010
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Quote:
Originally Posted by WhiteWoRX1
I have the cams and valvetrain installed, but have yet to put the motor in the car and fire it up.
same here, subscribed....
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Old 08-04-2006, 08:26 PM   #7
verc
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gt35r, 2.5L, meth

Default

Quote:
Originally Posted by mokujin22
Well, I'm having Gruppe-S put the 264 valvetrain into my 2.0L heads for a 2.5 hybrid. Hopefully, will get the assembled SB in the next couple of weeks.

What do you mean by "wiping?"

Tony
Wiping is when the lobes degrade. Upgraded cams have bigger lobes for more lift, and if the metal is of inferior quality they may alter shap and change the intake/exhaust duration of the cams. Bad times.
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Old 08-04-2006, 08:28 PM   #8
verc
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gt35r, 2.5L, meth

Default

Quote:
Originally Posted by wrxfactor
Tony,

Check the build date on your WRX, I've been reading on here that the early 02s had smaller ports in teh heads than later WRXs, even the later 02s and 03s. If your heads are already off and this is the case, you might as well port them. You don't wanna have that bad boy assembled and then see that the valvetrain is doing its job but the port sizes are screwing you.

Chris
Interestingly I have a late model '03 and my car came w/ shimless buckets
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Old 08-04-2006, 08:30 PM   #9
verc
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03 wrx
gt35r, 2.5L, meth

Default

I'll clarify on the exact nature of the problem:

- slight hesitation around 2500-3000 rpm
- periodically pulls timing. eventually goes into limp mode
- cyclical problem: car is fine for a week, then for week 2 pulls timing, goes into limp mode, week 3 car is fine again
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Old 08-04-2006, 08:32 PM   #10
verc
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03 wrx
gt35r, 2.5L, meth

Default

Quote:
Originally Posted by DrinkAV8
Are there alot of people just dropping the 264s in without doing the springs, retainers, etc?
This is what I'm wondering, it appears so. Which is why I'm asking since me and the other guy w/ problems both have the complete valvetrain.

it shouldn't matter though - 264 cams should drop in w/o need for a valvetrain upgrade methinks.
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Old 08-04-2006, 08:53 PM   #11
WhiteWoRX1
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Damn, sounds like a pain in the ass. Can you send them back and have them warrantied? It would SUCK to have to pull the motor, tear it down, and then wait god knows how long before you get an answer or a new set though. Hope everything works out.

I should have my car up by the end of the month, so I'll report if I have any issues.

BTW how many miles did you get before these problems started???
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Old 08-04-2006, 09:09 PM   #12
Drink
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Quote:
Originally Posted by verc
This is what I'm wondering, it appears so. Which is why I'm asking since me and the other guy w/ problems both have the complete valvetrain.

it shouldn't matter though - 264 cams should drop in w/o need for a valvetrain upgrade methinks.
That is what I thought & hoped. I have a new 257 for my hybrid setup and was considering some 264s myself. Verc, I'm curious about your hybrid? What turbo, head gasket, compression are you running?

Matt
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Old 08-06-2006, 02:48 AM   #13
verc
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gt35r, 2.5L, meth

Default

Quote:
Originally Posted by DrinkAV8
That is what I thought & hoped. I have a new 257 for my hybrid setup and was considering some 264s myself. Verc, I'm curious about your hybrid? What turbo, head gasket, compression are you running?

Matt

I'm running cometic .040 gaskets and APR headstuds. Compression would be up a bit, not sure exactly.

Turbo is a wrapped vf30.
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Old 08-06-2006, 02:51 AM   #14
verc
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gt35r, 2.5L, meth

Default

Quote:
Originally Posted by WhiteWoRX1
Damn, sounds like a pain in the ass. Can you send them back and have them warrantied? It would SUCK to have to pull the motor, tear it down, and then wait god knows how long before you get an answer or a new set though. Hope everything works out.

I should have my car up by the end of the month, so I'll report if I have any issues.

BTW how many miles did you get before these problems started???

These problems started immediately after tuning (took a while to confirm this was not due to the tune). I broke in the motor for 1k using only partial throttle so I wouldn't have known if anything was happening then.
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Old 08-06-2006, 04:46 AM   #15
bugeyes
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Default

Quote:
Originally Posted by verc
This is what I'm wondering, it appears so. Which is why I'm asking since me and the other guy w/ problems both have the complete valvetrain.

it shouldn't matter though - 264 cams should drop in w/o need for a valvetrain upgrade methinks.
It has been shown on dyno's here in Aus that even with standard cams the power drops off at high rpm's due to valve float. Add extra boost and you have boost pressure wanting to push the valves open which further effectively reduces valve spring seat pressure and drops to top end off even earlier.
From what I have seen upgrade the springs, its too hard to replace them later.

I honestly beleive stores tell you the cams drop straight in in order to keep the overall cost down and make the cams look more attractive to buy, but the truth is a different story.....
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Old 08-07-2006, 03:26 PM   #16
mokujin22
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Default

Quote:
Originally Posted by wrxfactor
Tony,

Check the build date on your WRX, I've been reading on here that the early 02s had smaller ports in teh heads than later WRXs, even the later 02s and 03s. If your heads are already off and this is the case, you might as well port them. You don't wanna have that bad boy assembled and then see that the valvetrain is doing its job but the port sizes are screwing you.

Chris
damn, got my car in Spring of 2001. one of the first batch at the dealership. i would be shocked if my heads didn't fit that description. they're out in California right now with Gruppe-S. i had pulled everything apart myself, but didn't trust myself to get the valve lash right on my shimmed buckets. imo, everything (except the heads and the tranny) is just nuts and bolts. enough time and elbow grease can get anything done.

i think that i'll give Geoff a call.

Tony
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Old 02-11-2007, 10:06 PM   #17
readymix
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Platinum Silver

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Quote:
Originally Posted by WhiteWoRX1 View Post
I have the cams and valvetrain installed, but have yet to put the motor in the car and fire it up. The only problem I have had so far is that the cams did not "drop in" as advertised. The thrust journals on all 4 cams were too wide and were binding in the head. I had to have them machined to fit.

I called Geoff at Gruppe-s to ask about this and he told me that he had only heard of one other customer that reported clearance issues with the cams. I talked to a couple of guys on here before buying the cams and they had yet to have any problems.
I'm also having this problem it seems. Both the intake and exhaust cam on my left side head are having binding issues thus far. I'm going to talk to my machinist tomorrow about machining the cams so they will fit.

Last edited by readymix; 02-11-2007 at 10:15 PM.
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