Notices
928 Forum
Sponsored by:
Sponsored by: 928 Specialists
View Poll Results: For only a head gasket replacement only on a 16v and no other service work, would you
Pull the motor
70.00%
Leave the motor installed & pull just the heads
30.00%
Voters: 40. You may not vote on this poll

Blown/Damaged Head Gasket?

 
Old 03-19-2019, 10:03 AM
  #46  
SwayBar
Addict
Rennlist Member
 
SwayBar's Avatar
 
Join Date: Feb 2006
Location: Chicago Bears
Posts: 2,340
Default

If you score Euro heads, then also find some Euro cams too.
​​​​​​
They are more supercharger-friendly in that they'll lower the dynamic compression ratio of the engine, thus, help minimize detonation.

Classic failure mode of a supercharged engine is a blown head gasket, and usually caused by detonation.
SwayBar is offline  
Old 03-19-2019, 10:20 AM
  #47  
Petza914
Addict
Rennlist Member
Thread Starter
 
Petza914's Avatar
 
Join Date: Oct 2007
Location: Clemson, SC
Posts: 10,649
Default

Originally Posted by SwayBar View Post
If you score Euro heads, then also find some Euro cams too.
​​​​​​
They are more supercharger-friendly in that they'll lower the dynamic compression ratio of the engine, thus, help minimize detonation.

Classic failure mode of a supercharged engine is a blown head gasket, and usually caused by detonation.
Actually, it looks like my current compression ratio of my '79 US car is 8.5:1 and the lowest of all 928 motors, so should be as supercharger friendly as they come. In '80, the US cars moved compression to 9.0:1,and for the Euros to 10.0:1.

83/84 US cars were 9.3:1
84-86 Euros were the highest at 10.4:1
85-86 US cars were at 10.1:1
then everything after that, except the GTS was 10.0:1 with the GTS being slightly higher at 10.4:1

If I end up putting heads onto my block, I'm going to install them with upgraded gaskets from 928MS. If I end up installing the 4.7 rebuilt motor, I'm going to leave things assembled as they are and drop it in. That motor would have a compression ration of 9.3:1 which should be OK. Probably going to install new fuel injectors just to be save if I go that route, unless I also change over to the L-Jet fueling system that's available with that motor.

Any opinion on K-Jet vs L-Jet for supercharged setups - avoiding a computer and tuning manually with mixture seems easier.
Petza914 is offline  
Old 03-19-2019, 01:42 PM
  #48  
[email protected]
Addict
Rennlist Member
 
j.kenzie@sbcglobal.net's Avatar
 
Join Date: Jun 2005
Location: Park Ridge, IL (near Chicago)
Posts: 2,794
Default

I would talk to Carl about L-jet vs K-jet. He has experience with both .
good luck
Dave
j.kenzie@sbcglobal.net is offline  
Old 03-19-2019, 01:47 PM
  #49  
jeff spahn
Addict
Rennlist Member
 
jeff spahn's Avatar
 
Join Date: Nov 2009
Location: Dubuque, IA
Posts: 7,459
Default

Originally Posted by polecat702 View Post
I had head gaskets blow on the exhaust valve side in my blower motors in the Pantera. It stopped when we O ringed the heads. I'd do a compression test on each cylinder. They don't always pop where you get water in the oil. I've seen them let go and the exhaust gasses push all the coolant out thru the cooling system. BTW, I got my radiator cap from Roger, and I believe it's a 13 pound cap. Also Greg Brown says the head gaskets on these cars are failing due to age related problems. My 89 is supercharged, and I'll be changing head gaskets as a precaution when I do the top end refresh.
Joe
Call me when you do that. I'd be happy to come out and help you pull the motor and do the heads. It's easier with extra sets of hands.
jeff spahn is offline  
Old 03-19-2019, 02:15 PM
  #50  
Petza914
Addict
Rennlist Member
Thread Starter
 
Petza914's Avatar
 
Join Date: Oct 2007
Location: Clemson, SC
Posts: 10,649
Default

Originally Posted by [email protected] View Post
I would talk to Carl about L-jet vs K-jet. He has experience with both .
good luck
Dave
Just did.

He says the K-Jet is a better fueling platform for supercharging providing it's in good shape (which mine is), so I'll be staying with what I have on that, but probably installing with new injectors and seals just to be safe, and some braided stainless fuel lines I've found.
Petza914 is offline  
Old 03-19-2019, 09:21 PM
  #51  
AirtekHVAC
Addict
Rennlist Member
 
AirtekHVAC's Avatar
 
Join Date: Mar 2012
Location: China Grove, NC
Posts: 2,885
Default

Pete, sorry to hear all this, hope it works out, and I hope you can get it done before SITM
AirtekHVAC is offline  
Old 03-19-2019, 09:35 PM
  #52  
Petza914
Addict
Rennlist Member
Thread Starter
 
Petza914's Avatar
 
Join Date: Oct 2007
Location: Clemson, SC
Posts: 10,649
Default

I bought the recently rebuilt 4.7L M28/19 motor today from user BC for very reasonable money - thanks BC! It was previously in ladybug's car.

So that's the plan...pull the motor and replace it with this 4.7 and then reinstall my K-Jet setup and supercharger onto it. Also going to install new injectors and Greg Brown fuel lines.

The motor will be starting the trip my way from San Diego sometime next week and I'll start doing prep work on my car in the meantime as I've now made a decent list of stuff I am going to do.

Hoping I can get it all put together in time for SITM.

If there's a good 16v Engine Pulling for Dummies (Rookies) writeup with step by step instructions someone could point me to, that would be awesome.

I'll pull the heads from my current motor after I get everything else done and decide what to do with it.
Petza914 is offline  
Old 03-19-2019, 11:49 PM
  #53  
polecat702
Vegas, Baby!
Rennlist Member
 
polecat702's Avatar
 
Join Date: May 2009
Location: far away
Posts: 10,989
Default

Originally Posted by jeff spahn View Post
Joe
Call me when you do that. I'd be happy to come out and help you pull the motor and do the heads. It's easier with extra sets of hands.
Thanks Jeff!!!!! I'll wait till you're snow bound and want to hit Vale on the way out. I wanna do the engine after we run down to 3rd coast, this year. Yank the motor, and get it back in before I have Tommy, paint the car. I'll have everything ready to do a quick swap. I have spares for almost everything. Plus all the new parts will be here too.

We'll tool around in the Pantera this time too. Gotta start driving it.
polecat702 is offline  
Old 03-20-2019, 09:03 PM
  #54  
BC
Addict
Rennlist Member
 
Join Date: Dec 2001
Posts: 24,494
Default

Originally Posted by Petza914 View Post
I bought the recently rebuilt 4.7L M28/19 motor today from user BC for very reasonable money - thanks BC! It was previously in ladybug's car.

So that's the plan...pull the motor and replace it with this 4.7 and then reinstall my K-Jet setup and supercharger onto it. Also going to install new injectors and Greg Brown fuel lines.

The motor will be starting the trip my way from San Diego sometime next week and I'll start doing prep work on my car in the meantime as I've now made a decent list of stuff I am going to do.

Hoping I can get it all put together in time for SITM.

If there's a good 16v Engine Pulling for Dummies (Rookies) writeup with step by step instructions someone could point me to, that would be awesome.

I'll pull the heads from my current motor after I get everything else done and decide what to do with it.
The motor removal is the hard part. Putting it back in is super fun. I stole the pallet from Costco today so ON SCHEDULE!
BC is offline  
Old 03-20-2019, 09:31 PM
  #55  
Petza914
Addict
Rennlist Member
Thread Starter
 
Petza914's Avatar
 
Join Date: Oct 2007
Location: Clemson, SC
Posts: 10,649
Default

Originally Posted by BC View Post
The motor removal is the hard part. Putting it back in is super fun. I stole the pallet from Costco today so ON SCHEDULE!
Thanks BC !
Petza914 is offline  
Old 03-20-2019, 09:35 PM
  #56  
karl ruiter
Addict
Rennlist Member
 
Join Date: Jan 2003
Location: Honolulu and sometimes L.A.
Posts: 2,660
Default

All easy stuff, especially on a CIS car.
Remove hood
Unhook exhaust
Pull fan and radiator
Unhook 14 pin electrical connector
Disconnect 2x fuel lines and throttle cable.
Disconnect driveline at clutch
Drop the clutch? (don't totally remember if I pull the clutch down or not. Probably makes the pull easier if you do as otherwise it has to come pretty far forward)
Bell housing bolts and motor mounts.
Pull baby pull.

WSM has a good write up, I think.
karl ruiter is offline  
Old 03-20-2019, 11:16 PM
  #57  
Petza914
Addict
Rennlist Member
Thread Starter
 
Petza914's Avatar
 
Join Date: Oct 2007
Location: Clemson, SC
Posts: 10,649
Default

Originally Posted by karl ruiter View Post
All easy stuff, especially on a CIS car.
Remove hood
Unhook exhaust
Pull fan and radiator
Unhook 14 pin electrical connector
Disconnect 2x fuel lines and throttle cable.
Disconnect driveline at clutch
Drop the clutch? (don't totally remember if I pull the clutch down or not. Probably makes the pull easier if you do as otherwise it has to come pretty far forward)
Bell housing bolts and motor mounts.
Pull baby pull.

WSM has a good write up, I think.
Thanks for the outline. I have the WSM and will look that up.

Does the hood really need to come off, or can you just disconnect the struts and make it more vertical or pad it lay it back toward the windshield.

I'm planning to put it on the lift so I can access things from above and below as need be, then roll it off the lift so I can get a cherry picker with leveler under it to lift the motor out.

Petza914 is offline  
Old 03-20-2019, 11:22 PM
  #58  
[email protected]
Addict
Rennlist Member
 
j.kenzie@sbcglobal.net's Avatar
 
Join Date: Jun 2005
Location: Park Ridge, IL (near Chicago)
Posts: 2,794
Default

Hi Pete,
The hood comes off easily and one person can do it. I popped the struts, then laid blankets across the engine and fenders. Then I lowered the hood until almost closed, but I could still access the hinge bolts. Pull the bolts and walk around to the front of the car and lift the aluminum hood. Very easy, and the access is vast.
Good luck,
Dave
j.kenzie@sbcglobal.net is offline  
Old 03-21-2019, 04:19 PM
  #59  
karl ruiter
Addict
Rennlist Member
 
Join Date: Jan 2003
Location: Honolulu and sometimes L.A.
Posts: 2,660
Default

Mark the position of the hood hinges with a sharpee. If you have fender service guards this would be a good time to use them as it is easy to bump the hood against a fender as you are lifting it, if you are doing it by your self.
karl ruiter is offline  
Old 03-21-2019, 04:28 PM
  #60  
SwayBar
Addict
Rennlist Member
 
SwayBar's Avatar
 
Join Date: Feb 2006
Location: Chicago Bears
Posts: 2,340
Default

Disconnect the engine at the torque-tube and bellhousing. Pull the engine with bellhousing attached.

Less is more at this stage.
SwayBar is offline  

Thread Tools
Search this Thread

Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: