HK G36C

What options are available other than factory ones that tend to fail? thank you.

FLYT993

HK--check this thread out....

https://rennlist.com/forums/993-forum/344503-valve-guides-best-aftermarket-non-oem.html

Father of 3

Call Steve Weiner.

Mike J

or just use SI guides....

HK G36C

Mike:


Where can I buy the SI guides? Why are they better than OEM? Any other options? TIA.

David

black ice

Don't know how the heck you link to this page but check out
http://www.heritagemotorcar.com/research/index.htm
and go to valvetrain components, then advanced material valve guides.
Don't know what they're made of but they look stout. I have seen them and they are even more impressive in person.

HK G36C

Thank you

pjc

The Titanic looked impressive!! What's that old saying about don't judge a book by its cover? Not saying the product is not class but hey guys it must be more than just good looking!

PJC

Mike J

Try Si Guides

There is a independant machinist here in Vancouver that does all the 911 guides for the dealer and most of the independant Porsche shops and that is where he sources his. He does lots of heads.... I am not sure where Steve sources his guides but I doubt he has formulated the metalurgy himself and manufacturers them since that is a really expensive process.....so he has likely found a good source that he likes and resells the product. Just like any business you don't reveal your sources since that would bypass your upsell

The OEM guides are known to be soft and wear quickly. Porsche has used the same guide material for years and there are number of theories why the 993's are more sensitive ranging from more heat generation to more sensitive computers. What is clear is the more knowledgable mechanics prefer to stay away from the OEM guides.....so I go with that.

Cheers,

Mike

Steve Weiner-Rennsport Systems

Mike:

We use a phosphorus-bronze guide made specifically for us to our own specifications based on 33+ years of doing Porsche heads right here in-house,...

I'm sure there are other viable solutions but this one has been singularly successful for a long time.

Mike J

My apologies if I am wrong....do you mean you have a custom formulation of metal copper and tin phosphide mixed specifically for you for the guides?

Red rooster

Thank goodness I dont need guides BUT if I did Steve would be the first
( only ? ) option !
Good luck

Geoff

Mike J

This is what I was trying to get at...a lot of the talk about guide materials etc. is opinion based. My engineering traininig is asking, for instance, what is the specific performance differences between Steve's guides, SI guides, Ollies's guides, Performance Engineering's guides, Gerry Woods's guides, etc.? What are the wear characteristics, heat conduction abilities etc? They are all very very reputable shops with many years of experience and they all sell their own guides, and of course to each supplier their guides are best!

What are the wear characteristics of each and how can you be sure which one is best? The premise that the OEM guides are crap has been confirmed by a number of experts (like Bruce Anderson) so I am willing to accept that. After that it gets more difficult since each expert recommends the guide they believe in...and there are no studies or hard comparision numbers I guess you have to go with your own opinion as well. It may not matter in the end anyways since I am sure guides from any of the shops I mentioned have many many installations behind them.

HK G36C

Mike:

How much did your guides cost?

TIA.

Mike J

It was included as part of the machining...the guides are actually not that expensive, its the labor for cleaning, removal, replacement, honing, fitting, valve seats, etc. that costs the money.

I had all six heads done for $700 CDN including the guides. It was a bit of a special deal which I won't get into the details....but I supplied new valves, seals and retainers as well. We checked the springs, they were fine and I was rebuilding on a budget so I elected not to upgrade the springs. This is a good option for DE and track junkies. Some valve stems were slightly below spec and some were close to spec so I just replaced the whole set. Don't forget I rebuilt my own engine from the crank up so labour is free and no uplift on parts :-) I gave the machinist my heads and got them back with new guides, retainers, valves ready for installation. He honed the guides to fit as well as machined the heads to check for flatness etc. If you are in B.C. PM me and I can give you his reference.

If you want to see the heads/valves etc. here are the threads for my DIY engine rebuild....if you have not read it and you want to see the inside of a 993 engine take a look!


Part 1 - Part I
https://rennlist.com/forums/993-forum/246553-diy-engine-rebuild-part-1-a.html

Part 2 - Cams and TIming
https://rennlist.com/forums/993-forum/246763-engine-rebuild-part-ii-cams-and-timing.html

Part 3 - Heads and SAI Passages
https://rennlist.com/forums/993-forum/246767-engine-rebuilt-part-iii-heads-and-sai-passages.html

Part 4 - The saga of the valve guides - and Carbon
https://rennlist.com/forums/993-forum/247279-engine-rebuild-part-iv-the-saga-of-the-valve-guides-and-carbon.html

Part 5 - Into the Depths
https://rennlist.com/forums/993-forum/247992-diy-engine-rebuild-part-v-into-the-depths.html

Part 6 - Exploring the SAI Passages
https://rennlist.com/forums/993-forum/249641-diy-engine-rebuild-part-vi-6-exploring-the-sai-passages.html

Part 7 - Cleaning, Cleaning, Cleaning..
https://rennlist.com/forums/993-forum/252373-diy-engine-rebuild-part-vii-7-cleaning-cleaning-cleaning-cleaning.html

Part 8 - Rods and last minute checks before glue ; - )
https://rennlist.com/forums/993-forum/254718-diy-engine-rebuild-part-viii-8-rods-and-last-minute-checks-before-glue.html

Part 9 - Sealing the tomb...
https://rennlist.com/forums/993-forum/256730-diy-engine-rebuild-part-ix-9-sealing-the-tomb.html

Part 10 - Piston's a puimping
https://rennlist.com/forums/993-forum/261227-diy-engine-rebuild-part-x-10-piston-s-a-pumping.html

Part 11 - Its all in the timing eh!
https://rennlist.com/forums/993-forum/262993-diy-engine-rebuild-part-xi-11-its-all-in-the-timing-eh.html

Part 12 - Messing up the looks of a clean engine..
https://rennlist.com/forums/993-forum/263215-diy-engine-rebuild-part-xii-12-messing-up-the-looks-of-a-clean-engine.html

Part 13- It would be part 13 eh?
https://rennlist.com/forums/993-forum/264001-diy-engine-rebuild-part-xiii-13-it-would-be-part-13-eh.html

Part 14 - Holy Crap!
https://rennlist.com/forums/993-forum/264329-diy-engine-rebuild-part-xiv-14-holy-crap.html


Cheers,

Mike