The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Log in to remove most ads.

Please Support RTM Racing
Please Support Rix Racing

1G So I tore down the engine.....Opinions needed

This site may earn a commission from merchant
affiliate links, including eBay, Amazon, and others.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Im on a felpro composite L19s @90ft lbs. 850+ awhp @45psi. No issues here and see no need in torquing it any higher. You guys that are over torquing and still having head sealing issues have problems else where. I.E. tune, softened head castings, deck prep....etc
Holy shit, 45 psi on a composite.... I think the key is surface prep number one. The deck surfaces need to be flat for both gaskets. Second I think if your pushing the motor past 30psi l19s are needed esp in a 7 bolt. Tuning is another major factor obviously but you can have a perfect tune and still push coolant if you half assed the assembly. I regret swapping out the oem studs for standard arps........pointless in my eyes. I used a oem head gasket and the material was eaten away from the core of the gasket.
 
To me it looks like because the deck and head were not perfectly flat under high load and cylinder pressure small amounts of combustion gas were escaping through the ring around the combustion chamber and eroding the area behind it. I think even if your head and block are within "spec" running 30 psi with a large turbo will destroy a gasket. If i was running 20 lbs on a 16g I bet the gasket would of been perfectly fine. This doesnt seem like detonation caused this, the car never detonated alot until AFTER the head gasket went completely. The car was making a hissing sound when i did pulls in 3rd on wot, at the time i had no idea what it was. After getting back home i realized the pressurized air was making through to my stainless overflow tank which has a tiny breather on top. This is just my opinion obviously....
 
Im on a felpro composite L19s @90ft lbs. 850+ awhp @45psi. No issues here and see no need in torquing it any higher. You guys that are over torquing and still having head sealing issues have problems else where. I.E. tune, softened head castings, deck prep....etc


This.

I currently have an MLS Mitsu with L19s at 90ft lbs. My head is o-ringed with SS wire. Done by none other than the man himself, Darren Thomas. He recommended this setup. I got tired of overtorquing crap and getting marginal results.
 
Manley turbo tuff motor Go big or go home
 

Attachments

  • IMG_1815.JPG
    IMG_1815.JPG
    290.2 KB · Views: 57
Holy sh**, 45 psi on a composite.... I think the key is surface prep number one. The deck surfaces need to be flat for both gaskets. Second I think if your pushing the motor past 30psi l19s are needed esp in a 7 bolt. Tuning is another major factor obviously but you can have a perfect tune and still push coolant if you half assed the assembly. I regret swapping out the oem studs for standard arps........pointless in my eyes. I used a oem head gasket and the material was eaten away from the core of the gasket.
L19's are not NEEDED for above 30psi, i was on 40psi with the 6466 and a felpro permatorque mls and didn't lift the head with standard arp's Thats not to say i won't be using L19's next time around. But they arent an absolute need. Its all about surface prep/good machining and then after that it's on the tune to keep it good
 
L19's are not NEEDED for above 30psi, i was on 40psi with the 6466 and a felpro permatorque mls and didn't lift the head with standard arp's Thats not to say i won't be using L19's next time around. But they arent an absolute need. Its all about surface prep/good machining and then after that it's on the tune to keep it good
I guess what I'm saying is that if your at 30psi with a large turbo, better safe than sorry. Honestly the stock 6 bolts studs appear as good as the standard arps. Has anyone even tested a new set of 6 bolts bolts vs standard arp studs? Do you even really need arps with a small turbo on a 6bolt? Has anyone confirmed lifting a head using a small turbo at high boost?
 
I've seen 40psi on my DSM76, composite gasket torqued to 95ftlbs. 1300mi on this motor now. no issues. I'll never understand why people question the abilities of a composite gasket.
 
I don't think it's a question of whether it can hold per say, but for how long under what conditions. Is the mls gasket more reliable under certain situations? After seeing how badly my oem failed......it just scares me. Even if my fear is unjustifiable and my fault.
 
I don't think it's a question of whether it can hold per say, but for how long under what conditions. Is the mls gasket more reliable under certain situations? After seeing how badly my oem failed......it just scares me. Even if my fear is unjustifiable and my fault.
I made it 14,000 miles and then my oil filter backed out and dumped the oil, never ever had a head gasket issue with standard arp's other stuff always failed first. If you have the extra cash though why not the L19 i just didn't at the time, and then there was a shortage for a while
 
I made it 14,000 miles and then my oil filter backed out and dumped the oil, never ever had a head gasket issue with standard arp's other stuff always failed first. If you have the extra cash though why not the L19 i just didn't at the time, and then there was a shortage for a while
I read your post, I was gunna purchase that oil filter before seeing your thread. What a heartbreaking situation.......
 
Clamp a worm hose clamp around your filter and "safety" wire that puppy on! I had mine back off on my car too so I take the time to do it now with my filters. Just a cheaper way for me.
 
Sorry no picture right now, next time I am at the car I will try to take one. Simply wrap the oil filter with a big hose clamp, tighten it down good and run a steel wire thru the "teeth" of the clamp and attach it to a bolt or nut that is within reach so it CAN'T spin off or even work its way loose on these motors that seem to vibrate a lot. I ended up loosing a turbo when mine came off midway through a pull so I had to shut the car off immediately but the turbo was hurt by doing that :(
 
Napa Gold FTW. Never had an issue with one falling off.
I always used a wix or napa gold and never had an issue for 14,000 miles, i bought the magnis and ran it 400 miles and it f***ed me, never occured to me to saftey wire because it's always been tight as hell to remove, the napa gold/wix has a fat o ring that keeps it tight, magnus's is like.... 1/8". Sometimes it doesnt pay off to try new things
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Innovation Products Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com RixRacing RockAuto RTM Racing STM Tuned

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Back
Top