where/how would i go about getting a .020 over marine gasket...and will anything else need to be modified to run it?

 

Cummins should be able to get them easily-- but will likely have to order unless you live near the coast (not a whole lot of inland Cummins marine engines).

AFAIK, no mods needed to run it, but I'd see if some of the bigger shops (Haisley, Scheid, etc) make thinner injector washers to drop the injectors back a little closer to the pistons.

jh

 

i live right on the chesapeake bay...lots of marine engines around. ill look up some of the local cummins shops and see if they have marine parts.

how much of a difference is .020 gonna make with the injector?

 

I'm guessing .020", but call a pro.... ! (Is that a "here's your sign", kinda thing?)

Just Jokin, GB, and sorry for the smart-aleck

Seriously, I'm not sure how much of a different it would make as far as smoke and such goes. Spray angle on an injector is matched to the piston bowl. Even slight changes in Spray angle affect how the fuel disperses when it hits the bowl, and can thus effect efficiency of burn.

That said, it's certain to be a LOT better than 370s in a 12V, and plenty of guys run those.

Maybe Don could whip up some sticks for you with a little deeper spray to account for the thicker HG. Try a PM to him and see what he thinks about the extra .020. It's probably much ado about nothing....

It's just a good idea to pay attention to the little things to make sure everything's playing well together.

jmo

Justin

 

well thanks for the help...i never would have thought about the spray pattern being different with a thicker HG.

ill talk to my parts supplier tonight about the marine gasket, and see if he can get one from cummins. should be a fun weekend pulling the head

 

Thinner washers are a no-no on a 24V. The connecter tube will have a hard time sealing if the injector drops down from where it should be. A changed spray angle (if anything) is what you would want.

 

thank you banshee...if its a matter of more smoke/a VERY SLIGHT difference in power then i dont mind the different spray pattern. i was thinking the change would result in much higher EGT's, or improper combustion or piston damage

 

Do they make a 24V .010 or .020 over. Every one I talk to says to use a modified 12V .10 or .20 gasket. I used a stock 24V gasket on mine, but my head only had to be decked .004. I would have like to of used a .010, but the local shop wanted more than I was willing to pay (over twice what a stock gasket was) and I needed my truck up and running.

 

the only difference between the 24v and 12v gasket is the size of the holes in some coolant passages. all you do is take a punch and make them bigger.

 

Possibly. What I meant is that yes you might gain some power, but you don't port the head as a major power adder. You might gain a little but not like what you would on a gasser. You port the head to support the power you have and any power that you might add in the future.

 

Just ported the head on my 12 valve this weekend. If you have a die grinder, take a look at the tech page on Piers site for a reference as to where to remove material and just be very careful and take your time. Dad and I cut aluminum sheet to protect the valve seat, but we removed it at the end to blend the wall into the inner angle of the valve job. Most of the work is on the intake, but we really cleaned up the exhaust nicely as well. Probably not quite as good as what you'd get from Piers or a race shop like Ray-Mac, but after talking to a lot of guys about it, it should still be a huge difference. Just throwing this in there in case you're on a budget. -Josh

 

PDW offers the 12v marine gasket modified for the 24v engine.... We almost always go with the .020 gasket for a rebuilt head that has been o-ringed.

As for porting, it does have its place...... But personally I feel like it is one of the last items to be done on a motor. You $$ would be much better spent on a good cam that a port job.

Doug Smith

 

Yeah, I shoulda known that