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korijo's Avatar
 
Join Date: May 2002
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Rockers/Pushrod question

Will the 1.7L set work in my 2.0L build? Just wondering... Got the 1.7L mostly torn down. Heads off, etc. SUPER CLEAN!!
Prolly rebuilt less than 10K, when tranny was (paperwork).

So, I wanna use p.rods and rockers in my 2L build. Any mods I could do to the rockers? I m currently reading up on ax rules, so I need to research the valvetrain workings, and head workings.

LMK whats up.....

Sorry, pics coming soon
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Old 01-12-2003, 07:54 PM
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Dave, we should put 911 swivel head adjusters in there.
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Old 01-12-2003, 07:56 PM
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The 1.7 stuff will work fine, especially if you use the 911 swivel feet. Note I said 911 Porsche swivel feet, do not use the VW, BugPack ones!!! Get em from Porsche, they last.
If you don't have the cash for em, I do have a set of 2.0L rockers here you can have. Need to order new Valve adjusters for em though. The 1.7 valve adjusters are smaller so I prefer the 2.0L ones for the stockers.
There are a few things to do if you install the swivel feet.....
Geoff
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Old 01-12-2003, 08:11 PM
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Any regulations for ax-ing?
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Old 01-12-2003, 08:44 PM
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No, you shouldn't have any problem with what type of rocker you use. It's like you can use any distributor you want or spark box.
Old 01-13-2003, 07:51 AM
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You sure about that, Zeke? Remember, autoX rules vary widely from area to area within the PCA. I don't know what the rules are up in OR/WA. (JP, care to comment?) If you're going SCCA, I think the rocker arms count as an "engine modification" and will push you to Prepared class....

--DD
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Old 01-13-2003, 09:54 AM
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I think Dave's car will have to run in GTU with all the changes he is doing to it. Check here:http://pnwr.pca.org/Track/autocross/rules.asp

Geoff
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Old 01-13-2003, 03:08 PM
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I have since changed my mind again. Hi-comp. p's, still 94's. Flat euro's, been cut for valves already. The pins are 22mm. Rods are H beams w/ chev journals.
What class am I headed for?

After reading those rules, I could fit in P class, right?

What about my 916 bumpers? I didnt see anything about body mods...

** after reading again, looks like Im headed for GTU, as Geoff said.
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Last edited by korijo; 01-13-2003 at 04:27 PM..
Old 01-13-2003, 03:35 PM
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Man, are you reading the rules? Compression, cam, alternate bumper materials, carbs, sway/spring mods changes put you in GTU.
Read ALL the classes for what mods you are allowed. It is fairly lax but within reason. At Bremertion the GTU is full of 914's, maybe 8. To place in the top half your car will have to be dialed in and have 205 R-tires, suspension mods,good hp, lightened, and a real good driver. If you want to win run in the other club that starts out with a novice class, the car doesn't matter that much. Last year my son was killing 'em by 3-4 seconds with my "stockish" 914.
Geoff
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Old 01-13-2003, 04:32 PM
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Quote:
Originally posted by Dave at Pelican Parts
You sure about that, Zeke? Remember, autoX rules vary widely from area to area within the PCA. I don't know what the rules are up in OR/WA. (JP, care to comment?) If you're going SCCA, I think the rocker arms count as an "engine modification" and will push you to Prepared class....

--DD
I thought aftermarket rockers with a different ratio is what they're after. To me a stock rocker is a stock rocker. They all fit on the same shaft. We're only talking about a screw size here. If you are correct, and you may very well be, then 911 adjusters are not allowed in stock class.
Old 01-13-2003, 05:48 PM
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EVERY engine I build gets 911 adjusters, even a stock 1700.
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Old 01-13-2003, 11:07 PM
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DOH! Sorry, Zeke--I meant the 911 adjusters... But with the way SCCA can be sometimes, the rocker arms might count as well!

Heck, even a "tuna can" (four) or Carrera tensioners (six; 911) dumps you into Prepared class.

--DD
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Old 01-14-2003, 07:59 AM
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To replace the 914 VW adjusters with 911 adjusters is a simple substitution thing? How many are there total, 8? And what year 911 engine parts are those which work, 1969-1973 2.0-2.4L 911 parts?
Old 01-14-2003, 09:27 AM
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It's not quite a simple substitution thing. You will have to do one or more of the following: Shorten the push rods, grind material off the part of the rocker arm that is closest to the valve, shim the rocker stands. It's generally a good idea to set up the rocker geometry when you do this. Which is a PITA...

The idea is to fiddle with those three quantities above until the threaded part of the adjuster is parallel with the valve stem when the valve is at half lift. Trial and error time... Having "zero rate" springs and one of those adjustable pushrod thingies brings it from just-about-impossible to pain-in-the-butt.

--DD

--DD
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Old 01-14-2003, 01:50 PM
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