ICONRACING993

I am one of the unlucky 993 owners who have gotten the dreaded exhaust valve guide wear. I am doing port and polish work on my heads and multi angle valve jobon the valves when my mechanic noticed it. I need to get 6 new exhaust guides. Does anyone know how much these cost from the dealer? I being quoted about 150US each.

I was told this will happen to most 993s which see a lot of heat in traffic, idle, engine covers on and heavy track days. Glad I caught it before I lost my motor.

Any help or info would be great

Steve Weiner-Rennsport Systems

Hi:

FWIW,...I would strongly suggest that you replace all 12 guides and hopefully with something better than the less-than-adequate factory ones.

We use a phosphorus-bronze type guide material made for us that works quite nicely.

ICONRACING993

HI Steve,

That's exactly what I'm using. A bronze sleeve reemed or honed to each particular valve. The valves given to me by my mechaic are "SODIUM" filled. Is that aftermarket or is that factory?

Do you know how much the valves would cost each? Exhaust side or intake side?

thanks so much for your input.

Steve Weiner-Rennsport Systems

[quote]Originally posted by ICONRACING993:
<strong>HI Steve,

That's exactly what I'm using. A bronze sleeve reemed or honed to each particular valve. The valves given to me by my mechaic are "SODIUM" filled. Is that aftermarket or is that factory?

Do you know how much the valves would cost each? Exhaust side or intake side?

thanks so much for your input.</strong><hr></blockquote>

Hi:

I hope they are not simply bronze and they should never,...ever be reamed. They must be honed to fit if you expect them to last any length of time and transfer heat as they are supposed to do.

Sodium-filled exhaust valves are Porsche OEM. Intake valves are not sodium-filled. ATE is the OEM brand.

If you care to call me, I'll be happy to quote you prices on the valves for you.

LAT

[QUOTE]Originally posted by ICONRACING993:
[QB]I am one of the unlucky 993 owners who have gotten the dreaded exhaust valve guide wear. lost my motor.

How many miles on the motor and what year is the car.

ICONRACING993

Hi Steve,

Thanks for the info. I talked to my mechanic today and he told me exactly what you told me. Honed and phosphorus-bronze sleeves.

Is it "OK" just to use factory valves with the mutiangle valve job and phosphorus-bronze sleeves?

Do you reccommend titanium or aluminum valves?

LAT: My car is a 1997 Carrera with 25,000 miles on it.

Steve Weiner-Rennsport Systems

[quote]Originally posted by ICONRACING993:
<strong>Hi Steve,

Thanks for the info. I talked to my mechanic today and he told me exactly what you told me. Honed and phosphorus-bronze sleeves.

Is it "OK" just to use factory valves with the mutiangle valve job and phosphorus-bronze sleeves?

Do you reccommend titanium or aluminum valves?

LAT: My car is a 1997 Carrera with 25,000 miles on it.</strong><hr></blockquote>

Good to hear,.......

Just use Factory OEM valves with the stock 3-angle job and you will be in great shape. I only use titanium valves in race engines that will see RPM's over 7000. AFAIK, there is no such thing as aluminum valves as they would readily melt.

Some folks use stainless steel ones but IMHO, the OEM ones are better for everything but full-race applications.

Bill Verburg

Steve, would you recommend stock valve springs for use w/ 993RS cams or the AASE, Eibach..? I'm getting conflicting advice here.

How about retainers some folks recommend Ti only on race engines due to durabilty. How about the holey ones?

Stock 993 hyd. adjusters are already lighter than the 964 style mechanical.

Can you provide any info on updated hyd. adjusters w/ perhaps Teflon inserts?

Steve Weiner-Rennsport Systems

[quote]Originally posted by Bill Verburg:
<strong>Steve, would you recommend stock valve springs for use w/ 993RS cams or the AASE, Eibach..? I'm getting conflicting advice here.

How about retainers some folks recommend Ti only on race engines due to durabilty. How about the holey ones?

Stock 993 hyd. adjusters are already lighter than the 964 style mechanical.

Can you provide any info on updated hyd. adjusters w/ perhaps Teflon inserts?</strong><hr></blockquote>

Hi Bill:

I only use the AASE valve springs, nothing else. IMHO, those the best ones money can buy and after seeing many engines spun over 10K, (accidently) with no damage, this is all I will use.

I never use stock springs in an engine that will be used for serious DE work. The OEM springs simply sag over time and the threshold of valve float goes lower & lower.

We have our own titanium retainers made and have never had a failure. These are very durable and we use them in street & race motors, alike. Titanium is a very fussy metal to work with and if not done right, they can fail.

I have no personal experiences with any updated hydraulic adjusters; frankly, I've never had trouble with any of them since I have all of our clientel perform a strict oil change regimen,..

Only race engines that will see consistent RPM over 7000 get mechanical rockers; the rest of them stick with hydraulic ones if they came so equipped.

Speedraser

Shot guides at 25,000 miles??? That's frightening, and I find it hard to believe it's common. That's worse than the thermal reactor 2.7 cars, which supposedly would last until 30K. My '95 has 50,000, and there is no indication that anything is wrong. Is this one of those things that just happens to some cars (like the later 3.2 Carreras)? If it doesn't happen by a certain mileage, is it likely that it won't happen at all (at least until VERY high mileage)?
<img src="confused.gif" border="0">

Bill Verburg

Steve, Thanks once again!

LAT

Would oil consumption be an indicator of valve guide wear. I am burning about 1 litre every 2,000 Km. or 1 quart every 1,000 miles. I do not do DE's with this car, cabriolet, but I do cruise at 85+ mph for hours on end.

Terry Adams

LAT, I was burning 1 qt per 400 miles on my previous '87 3.2 Cab when worn valve guides prompted a top end rebuild at 110K miles. You could see the smoke coming out the exhaust. It appears that oil consumption on a 993 diminishes with higher mileage. One qt per 2K km (1200 miles) seems only a shade high, maybe normal if you have a low mileage car. My recent 3600 mile drive up to and through British Columbia used only 1.5 quarts.

LAT

Beautiful country to drive in, where did your trip take you.
My car has 55,000km or 34,000mi. I don't think of this as a high mileage for a 97. Possibly I will get better consumption with time. I diaries faithfully and will
post any significant change.

Terry Adams

Somehwat OT, so here's the link to a prior post:

<a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic&f=3&t=005563" target="_blank">British Columbia itinerary</a>