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Post by hutcho on May 18, 2008 19:38:20 GMT -5
Hello Im new to forums. Ive rebuilt a 78 sr500 which Ive had in the shed foe years and followed some of the club tips on the SR500 owners site and installed the Porsche option adjusters. How are these little fellas adjusted. Do you use the usual .006 gap on the inlet valve and .008 on the exhaust or do you screw them down until the adjuster just touches the end of the valve stem and let oil and porsche engineering do the rest?? Have used new stock cam if thats any help. Thanks folks. Hutcho
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Post by chew652 on May 18, 2008 23:00:43 GMT -5
I set mine as stock which I believe is .004 IN .006 EX.
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Post by aero on May 19, 2008 2:46:21 GMT -5
You definately need to set them with clearance as stock. They are not hydraulic adjusters in the true sense of the meaning. The ends will fill with oil more to lubricate and take the free play out of the ball joint not between the cam follwer and the valve.
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Post by hutcho on May 19, 2008 3:12:48 GMT -5
Thanks folks, Ill get into the shed tomorrow and set them right.
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Post by miker on May 19, 2008 9:34:55 GMT -5
Are these any quieter than the stockers? Where do you get them?
miker
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sven
Full Member
Posts: 166
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Post by sven on May 19, 2008 14:24:11 GMT -5
O.k., the Porsche adjusters treat the stem ends with perfect care
and adjusting clearance is easy with them, but I wouldn't
recommend them anyway, not because they were bad, but they
don't really fit the design of the SR valvetrain:
- the "foot" is bigger in diameter than the thread, i.e they have to
be installed from below, i.e. rockerbox needs to be removed for this
- the foot is higher than the space between rocker and stem end, i.e
material from below the rocker has to be removed to make them fit
- thread starts high over contact area, i.e only little overlap between
rocker- and screw thread
- they are heavy
Kedo offers a similar kind of adjusters without these disadvantages.
They are easy to install, a pain to adjust and worked fine in my racer.
Regards
Sven
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Post by chew652 on May 19, 2008 16:46:12 GMT -5
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Post by hutcho on May 19, 2008 18:06:10 GMT -5
Got the part numbers from the sr500 owners web site and ordered them from porsche dealer Melbourne. Cost about $22 each and yes they are pretty quiet. I just followed the instructions in the SR site when rebuilding the to end. Its a bit weird taking an anglegrinder to the rockers to make them fit. Seem to work. Adjusted them last night and all's well. hutcho
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Post by aero on May 20, 2008 3:16:49 GMT -5
I used to supply the Porsche adjusters. I bought them in batches direct form Germany to get prices way better then $22 (Aus) each. In fact I think the great majority of these I sold went to Aus!
However I stopped supplying for all the reasons SCM has mentioned. Having used them myself I don't believe that they are a good mod. I know thay can be made to fit and work, but what problem do they address? I'm waiting for the first rocker arm to snap where they have been over zealously ground back to be honest.
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sven
Full Member
Posts: 166
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Post by sven on May 20, 2008 10:09:10 GMT -5
Hmm, not so easy, the page can't be linked. KEDO's homepage: www.kedo.comchoose "online catalog" in the menu, the adjusters are on page 26. The tuning section is on pages 9 - 39, oilcoolers and supply on 40 - 48, inlet (filters, carbs, manifolds) on 49 - 66, engine spares and special parts on 67 - 110, then come exhaust-systems (with a very nice complete race-exhaust for SR500 on page 113) ... Regards Sven |
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Post by aero on May 20, 2008 10:25:56 GMT -5
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sven
Full Member
Posts: 166
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Post by sven on May 20, 2008 11:03:31 GMT -5
 Awesome! How did you do it? |
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Post by aero on May 20, 2008 13:29:38 GMT -5
look near the bottom for the 'fully defined page' link. It opens a new window with the web address for the page. I spend way to much time on here!
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Post by caferacercarl on May 23, 2008 4:17:25 GMT -5
Yes, fitting them is not for the average guy at home with limited tools etc, and takes time to get them fitted right/adjusted but saying that we haven't had one break yet, and andy regularly pressed up on the reverse gear change instead of down for a higher gear, and hit over 11,000 rpm recorded on the datalogger dash, the intake had 630 thou lift and good spring pressure but all sharp edges were removed and the rockers de burred etc, the guy's are right, get them done professionally if you haven't got the tools. you only really need something like them if you are going to rev the thing above 5k most of the time, [like a carillo rod, its insurance for high revs] cheers.
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sven
Full Member
Posts: 166
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Post by sven on May 23, 2008 9:43:29 GMT -5
Yeah, but there are "full area"adjusters in a different design, neither Porsche- nor KEDO-like. Unfortunately not available in M8x1 thread, but could be done by an ambitious guy with a lathe. These are similar to the Porsches, but the foot isn't fixed to the joint at the end of the screw, so they can be mounted without removing the rockerbox... Here's a pic of them (not the nicest finish, I know, it's just to show the design):  Regards Sven |
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