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.

  • Join the Community!

    DSMtuners is a massive archive of DSM information - but more importantly, it's a COMMUNITY! Join in and participate with other DSMers, and invite all of your DSM friends to make this place their home. Chat with others, create a build thread, post questions and answers. Get involved! Logging in will also remove many of the advertisements, along with this notice. ;) It will also allow you to view images in threads.

Please Support Morrison Fabrications
Please Support ExtremePSI

97 eclipse

Year
1997
Model/Trim
Mitsubishi Eclipse GST

JeffGS-T97

Supporting Member
631
368
Mar 22, 2019
Muncie, Indiana

DSMPT

DSM Wiseman
1,475
1,022
Jun 12, 2014
Japan / Mexico, Arizona
Good god i think I need a new head. Machine guy called me about nicking the valves when decking the head. I picked it up and brought it home. I feel sick.
Why need a new head? Because the edge of valves are nicked or is the surface bad?

Hmm it’s not cut straight as in it’s cut more on the intake side. Idk if that’s good or not.

Tony, it's because the intake valve diameter is larger than exhaust valve's.
 

JeffGS-T97

Supporting Member
631
368
Mar 22, 2019
Muncie, Indiana
Why need a new head? Because the edge of valves are nicked or is the surface bad?


Tony, it's because the intake valve diameter is larger than exhaust valve's.
Well i figured too much material got taken out of the combustion chambers and the valves wouldn't clear the pistons. The surface is excellent. He removed .007 today so there was warp. I noticed that the other day doing the straight edge and flashlight trick.
 

DSMPT

DSM Wiseman
1,475
1,022
Jun 12, 2014
Japan / Mexico, Arizona
Well i figured too much material got taken out of the combustion chambers
You think that because the intake valves are nicked? If so, it's normal that intake valves get nicked if you don't remove valves before resurface head, because the edge of intake valves would slightly be below the surface.
 

DSMPT

DSM Wiseman
1,475
1,022
Jun 12, 2014
Japan / Mexico, Arizona
Ok so is my head ok to use?
To be 100% sure, you have to measure the height like the link that Tony mentioned earlier. but judging by the pic, actually I don't see a big problem and it looks still within spec. I would use this head as long as if valves seat/seal well and if the surface is totally flat and straight (assuming if the height is ok).
 

TK's9d2TSi

Supporting Member
5,096
2,272
Sep 11, 2017
Cincinnati, Ohio
Thank you Tony for the link man. Thank you Hiroshi, you guys really are a huge help and i appreciate you guys taking the time to help me with good quality information. I'll get the necessary tools and check the spec. Tony i might need you to pray to the DSM gods again LOL
I got you Jeff 🙏🙏🙏:dsm::laser::talon:
 

JeffGS-T97

Supporting Member
631
368
Mar 22, 2019
Muncie, Indiana
Quick update I checked the clearances and height with the measuring equipment at work during my lunch and i think im good to go. The reasembly can take place as soon as i get the gaskets.
On another note i decided to remove my windshield banner as it comes across as redundant. But i have to say less is more.

You must be logged in to view this image or video.


You must be logged in to view this image or video.
 

JeffGS-T97

Supporting Member
631
368
Mar 22, 2019
Muncie, Indiana
Since had the head apart earlier this year i was curious to find out if pulling the cams out would require bleeding the lifters before installing the cam shafts.
 

JeffGS-T97

Supporting Member
631
368
Mar 22, 2019
Muncie, Indiana
Started shopping for my head gasket and decided on a cometic MLS. After measuring i need a 85.5mm bore. With that said I am trying to decide on thickness. The machine shop removed .007 to flatten the head. Any recommendations?
 

DSMPT

DSM Wiseman
1,475
1,022
Jun 12, 2014
Japan / Mexico, Arizona

JeffGS-T97

Supporting Member
631
368
Mar 22, 2019
Muncie, Indiana
So I picked up a new set of calipers and measured the cylinder walls and the original HG piston hole ID. The cylinders measured 85mm in the block and the HG holes measured 86mm.
That seems strange considering there is a 85.5mm gasket available. Would it work better with a 85.5mm or an 86mm, or does it even matter?
 

DSMPT

DSM Wiseman
1,475
1,022
Jun 12, 2014
Japan / Mexico, Arizona
It's not strange at all that you have 85.00mm cylinder bore and 86.00mm bore gasket. Mitsubishi head gaskets have 86.00mm bore and stock cylinder bore is 85.00mm. That is designed to work +0.5mm and +1.0mm oversize OEM pistons too. Both 85.50mm and 86.00mm would work just fine. If speaking strictly, 85.50mm would be ideal, also you would have more material between cylinders. So I would go with 85.50mm.
 

JeffGS-T97

Supporting Member
631
368
Mar 22, 2019
Muncie, Indiana
It's not strange at all that you have 85.00mm cylinder bore and 86.00mm bore gasket. Mitsubishi head gaskets have 86.00mm bore and stock cylinder bore is 85.00mm. That is designed to work +0.5mm and +1.0mm oversize OEM pistons too. Both 85.50mm and 86.00mm would work just fine. If speaking strictly, 85.50mm would be ideal, also you would have more material between cylinders. So I would go with 85.50mm.
Hiroshi you are a mountain of info my friend, thank you very much!
 

JeffGS-T97

Supporting Member
631
368
Mar 22, 2019
Muncie, Indiana
Did a few things thisnmorning after doing the yard work.
Before and after photos of a couple things.
-polish radiator
-clean the head
 

Attachments

  • 20210914_102202.jpg
    20210914_102202.jpg
    488 KB · Views: 6
  • 20210914_103257.jpg
    20210914_103257.jpg
    570.8 KB · Views: 6
  • 20210909_182603.jpg
    20210909_182603.jpg
    474.1 KB · Views: 6
  • 20210914_110228.jpg
    20210914_110228.jpg
    678 KB · Views: 6

JeffGS-T97

Supporting Member
631
368
Mar 22, 2019
Muncie, Indiana
Got my destroyed ARP stud replacement today. The replacement bolts i purchased are bigger than the ones i took out so im unsure of why but a bigger diameter nut on each of the studs should help in the future to not strip them.
You must be logged in to view this image or video.
You must be logged in to view this image or video.

I got the ignition coils put in along this a freshly polished fuel rail after flow testing my injector. I've pretty much done all that can be done until i get the Head Gasket. I can't wait to get it back on the road.
You must be logged in to view this image or video.
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com Raven Fabrication RixRacing RockAuto RTM Racing STM Tuned VR Speed Factory

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Top