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Old 08-11-2019, 09:30 PM   #1 (permalink)
GMPatrol
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6.2l diesel with 6.5 head gaskets and effect of CR

G'day everyone, has anyone measured or calculated what the compression ratio on a 6.2l is when using late 6.2l/6.5l heads and 6.5l head gaskets is?

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Old 08-12-2019, 08:56 PM   #2 (permalink)
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The same, the combustion chambers have the same cc's give or take .020...

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Old 08-12-2019, 08:57 PM   #3 (permalink)
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Ratio is 21:1 or so....
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Old 08-12-2019, 09:20 PM   #4 (permalink)
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Thanks for the reply sc, i havent had much to do with the early big valve 6.2 head so wasnt sure if the late 6.2 head made any difference, ive only ever used 6.5 head gaskets on 6.2 and no ill effects but i was more out of interest in how much the gaskets lower the cr being 80thou bigger, planning on a low cr 6.2 turbo if i can't get another 6.5 block cheap
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Old 08-13-2019, 05:17 PM   #5 (permalink)
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You won't get low compression with gaskets alone.... well if you go with a really thick gasket you could...
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Old 08-13-2019, 05:27 PM   #6 (permalink)
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Yup and you should not put 6.5 gaskets under 6.2 heads as 1 spot in the corner may or may not seal...
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Old 08-13-2019, 10:42 PM   #7 (permalink)
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Thanks SC, 18:1 pistons worth while you think?, thanks bigboytoys that must be on the early heads, the late 6.2 head is the same as the 6.5 head and match the gasket fine ive done heaps of them but something to watch out for, built a few but only back to std and wanting to build one a bit hotter than standard probably hx40 but not crazy and not trying to reinvent the wheel either
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Old 08-14-2019, 02:41 AM   #8 (permalink)
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It's pretty much all 6.2 heads. Some will seal and some won't with a 6.5 gasket. It's the upper right hand corner that will give you grief, 6.5 heads can use either. Been there and fought will leaker's...



Hmmm, your in a warm climate and with a good IP, yes, 18-1's can work. If your going that far there is other work to do like lower end girdle and possibly hard block filling the engine block. Balancing and a fluid damper is also on that list. A really good IP guy will also limit the low end fuel and push more to the top which also makes them live and work better when leaned on.



6.2/5's can be made to make power but they are still and economy diesel. Compare one to a 6.9/7.3 or a 5.9 and it becomes apparent really quick.



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90 Burb 1500 Silverado 4x4, 6.x in the shop, ATS Turbo on the bench . Open plenum intake. 700 R4 Now Rebuilt + 241, 10,000lb Trany Cooler With 10in pusher Fan and gauge. 8,000 LB Warn Multi Mount. TCC lock up control, 60 + 14b 4" Lift and 285 16's. ΜΟΛΩΝ ΛΑΒΕ
Quote:
Originally Posted by happypunch View Post
it would be nice if it could deflect a deer or a prius...
Quote:
Originally Posted by Livelli View Post
Mine ate about 6ft of paper towel once. It idled funny for a minute, then let out one big black firey fart and smoothed right out.
Quote:
Originally Posted by ManyStepsKY View Post
My being able to set at the computer and type is evidence that my wife has not cut off both my arms and used them to beat me into a coma, so no, I did not buy it!
Post up pics of your carnage!!!! and timing ....Click Here
To bleed or find an air leak, simply, here’s a few different ways..
https://www.dieselplace.com/forum/8492425-post11.html
https://www.dieselplace.com/forum/63...leak-6-2l.html
https://www.dieselplace.com/forum/63...ht-turn-3.html
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Old 08-14-2019, 04:28 AM   #9 (permalink)
GMPatrol
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Thanks Bigboytoys but i think block filler is getting hotter than i was planning lol but yes all the other mods are good to do anyway, lowering the compression ratio was something i was thinking about just to make it a bit easier on it, id rather over build it and have it under perform, even reducing the cr back to the late 6.5 ratio will help longevity as a turbo, i dont want to suggest hp or boost numbers as you know there are so many variables but id suguest 220fwhp and 15-18psi would be the limits to what im aiming for which is easily attainable with a 6.5 and not crazy, the recipient for the engine will be a 3200lb utility like a El comino, yes cant compare a 5.9 or 6.9/7.3 but they dont fit into many things either lol
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Old 08-14-2019, 12:35 PM   #10 (permalink)
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Lemi guess a Holden....I’m a half Kiwi in a half a year frozen waste land...

Ya there are little tweaks and tricks that can be done, then there are full builds. I would strongly suggest the balancing, fluid damper and bottom end girdle for longevity sake.

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90 Burb 1500 Silverado 4x4, 6.x in the shop, ATS Turbo on the bench . Open plenum intake. 700 R4 Now Rebuilt + 241, 10,000lb Trany Cooler With 10in pusher Fan and gauge. 8,000 LB Warn Multi Mount. TCC lock up control, 60 + 14b 4" Lift and 285 16's. ΜΟΛΩΝ ΛΑΒΕ
Quote:
Originally Posted by happypunch View Post
it would be nice if it could deflect a deer or a prius...
Quote:
Originally Posted by Livelli View Post
Mine ate about 6ft of paper towel once. It idled funny for a minute, then let out one big black firey fart and smoothed right out.
Quote:
Originally Posted by ManyStepsKY View Post
My being able to set at the computer and type is evidence that my wife has not cut off both my arms and used them to beat me into a coma, so no, I did not buy it!
Post up pics of your carnage!!!! and timing ....Click Here
To bleed or find an air leak, simply, here’s a few different ways..
https://www.dieselplace.com/forum/8492425-post11.html
https://www.dieselplace.com/forum/63...leak-6-2l.html
https://www.dieselplace.com/forum/63...ht-turn-3.html
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