454 blown intake gasket? Just add Diesel! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Dieselwrencher** · 06-22-2016, 02:39 PM

The outlet plate is the same I believe. I have one of each and I'll try to lay them together and get back to you. Are you going to try to push the crank out of the block so soon on the ol gm diesel?

justcuz · 06-26-2016, 05:25 PM

I'm not a diesel guy, but I thought bigger exhaust, water or alcohol injection or an intercooler lowered EGTs. Increasing turbo size and flow is packing more air into the combustion process which would tend to raise EGTs, or am I missing something?

jbclassix · 06-29-2016, 11:44 AM

Quote:

Originally Posted by Dieselwrencher

The outlet plate is the same I believe. I have one of each and I'll try to lay them together and get back to you. Are you going to try to push the crank out of the block so soon on the ol gm diesel?

Shouldn't be building any more boost, hopefully. I just want to keep the EGT's down going over Colorado's little hills. I am modifying the stock wastegate controller to work on the HX40 as well.

Quote:

Originally Posted by justcuz

I'm not a diesel guy, but I thought bigger exhaust, water or alcohol injection or an intercooler lowered EGTs. Increasing turbo size and flow is packing more air into the combustion process which would tend to raise EGTs, or am I missing something?

The Turbo on the 6.5's is tiny. At sustained RPM's the turbo becomes like a restriction in the exhaust which builds heat. An intercooler, and WMI are in the works, just not the budget at the moment as well.

justcuz · 07-03-2016, 01:18 PM

Thanks for that, I learned something new.
I always thought smaller turbos spooled up faster giving power at lower RPMs. Never thought about outlet size.
I know some turbos come apart so you can change the inlet and exhaust positions, would that allow mixing of housings to change intake and exhaust sizes? Does an increase in turbo size increase the size of everything?

jbclassix · 07-05-2016, 01:17 AM

you are correct. small turbos spool up quicker and produce power at lower engine rpms, but anything over 65mph and the poor little gm turbo is like breathing through a straw while working out. I've thought about hybrid holset set ups using 35 and 40 parts, I've looked at other Garrett and IHI options as well as Cat, but in the end it came down to what I found on craigslist in my price range.

06-22-2016, 02:39 PM	#1
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,141	Re: 454 blown intake gasket? Just add Diesel! The outlet plate is the same I believe. I have one of each and I'll try to lay them together and get back to you. Are you going to try to push the crank out of the block so soon on the ol gm diesel? __________________ Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project *Tired of spark plugs? Check this out.*

06-26-2016, 05:25 PM	#2
justcuz Registered User Join Date: May 2008 Location: Alta Loma, Ca. Posts: 930	Re: 454 blown intake gasket? Just add Diesel! I'm not a diesel guy, but I thought bigger exhaust, water or alcohol injection or an intercooler lowered EGTs. Increasing turbo size and flow is packing more air into the combustion process which would tend to raise EGTs, or am I missing something?

07-03-2016, 01:18 PM	#4
justcuz Registered User Join Date: May 2008 Location: Alta Loma, Ca. Posts: 930	Re: 454 blown intake gasket? Just add Diesel! Thanks for that, I learned something new. I always thought smaller turbos spooled up faster giving power at lower RPMs. Never thought about outlet size. I know some turbos come apart so you can change the inlet and exhaust positions, would that allow mixing of housings to change intake and exhaust sizes? Does an increase in turbo size increase the size of everything?

07-05-2016, 01:17 AM	#5
jbclassix Junk Yartist Join Date: Jul 2009 Location: Greeley, CO Posts: 2,203	Re: 454 blown intake gasket? Just add Diesel! you are correct. small turbos spool up quicker and produce power at lower engine rpms, but anything over 65mph and the poor little gm turbo is like breathing through a straw while working out. I've thought about hybrid holset set ups using 35 and 40 parts, I've looked at other Garrett and IHI options as well as Cat, but in the end it came down to what I found on craigslist in my price range. __________________ -Jeremy YOU ONLY FAIL IF YOU STOP TRYING 70 Crew Cab Build Link 70 GMC Suburban 4X4 build thread 95 Yukon Daily Driver Rebuilding an NP205



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