I am having seat recession and need help deciding what material to use.
I had AFR heads with ductile iron seats, CMI headers with stock tails.
There is a rust trail going up the primary pipes, leading me to believe this is water related.
I have already had the tails lengthened to go through the transom before mixing the water.
What material does Merc use for the 525efi EX seats?
What temp do the 525's run at?
Is there a material that wont corrode and will hold up to performance boating?
Thanks in advance
Jeff

make sure you have the correct spring press for your cam and application you can use a jloy hardened seat make sure the head has the proper interference fit you will have great success with these seat or tucker out of texas can make you some hardened seat also best of luck Sincerely Laz Mesa
www.mesaracingengines.com

Laz
Thanks for the quick reply. Is jloy a brand name, if so where can I purchase them?
Jeff

Jeff,
Jloy is a brand name. The manufacturer is SB International (SBI) Your machine shop should be able to get them for you. They are a very well known brand of valve train parts. If you are having a problem, I would use thier Star Series seat, but you really need to find out what is causing the problem to begin with.

http://www.sbintl.com/products.html

Bill Koustenis
Advanced Automotive Machine
Waldorf Md

How well does a Copper Beryllium seat compare to the Jloy Star Series seat? Does Jloy make a copper beryllium seat?

Bill
Thanks for the advise.
I agree with you that I need to find the problem. I think it is a mild case of water reversion. If I pull the O2 plug when idleing I get water vapor. The back cylinders (7and 8) were not affected, the others have a straighter shot at the exhaust valves.

Kamma
I was told not to use the copper berillium seats because they are too soft and won't transfer heat properly.
I was also told not to use the propane seats because they are too hard. I am not sure who to believe.

Kamma
Do you have AFR heads and are you having seat problems also ?

Yes, I have AFR heads w/230hrs or so, but I am not currently experiencing any seat problems---at least none that I know of at this point. I run Stellings full length tubular dry headers. The cams I am running (hyd roller) are easy on the valve train and have very little overlap....so, pretty slim chance of any reversion. The cams came from RMBuilder.

A few weeks ago there was a thread regarding "Copper Beryllium" seats and it sounded like they are supposed be the chit as far as durability (rust), valve bounce dampening effect, but I truely do not know either. I think I may have asked my engine builder at one time a few years back and I forgot what he said. I wouldn't mind using copper beryllium seats the next time I rebuild.

Laz, what is your take on copper beryllium seats in either a steel or aluminum head?

kamma
I am also running a hyd roller designed by RMBuilder.
The cam works very well with a very good idle, also very impressive mid and top end.
Do you plan on doing a leak down this winter?
With your dry headers I doubt you have the problem that I do.
My motors were running great, I caught the problem during routine winter checkup.

Jeff

Jeff,
These to companines make seats for many companies in the industry:
Marin Wells has been around for many years and have supplied mostly automotive seats to the industry:
www.martinwellsco.com

Tucker's known for their seats used in the petroleum industry but have made seats for automtoive for many years. They mfg some of Brodix's stuff:

www.tuckervalveseat.com