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#1229748 - Sat Aug 12 2017 06:12 PM Re: Question for Engine Purchase [Re: youngclassicfan]  
tclederman  Online
Joined: Sep 2001
Posts: 25,405
Jarvisburg, NC
JW51,

Good question, good answer, and good use of "dipper" rather than splasher. Anyone who knows better, and knows GM engine specs/history, knows that a real splash-oil engine is a far different engine than a 216 and from the similar low-pressure 235s (1941-1953).

However, the early low-pressure 235 was a relatively uncommon engine (as you noted) - only used/optional on lower-production large trucks.

But, the low-pressure 235 would be noticeably more powerful than a 216.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 46 years
1954 3104 5-window pickup w/Hydra-Matic
Z-series (54/55) GMC 350 (2-ton) COE
If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.


#1229759 - Sat Aug 12 2017 07:58 PM Re: Question for Engine Purchase [Re: youngclassicfan]  
JW51  Online
Shop Shark
Joined: Jan 2014
Posts: 904
Missouri
Even though I don't mind using inaccurate terminology when it makes the same point, I know it can be a pet peeve for Professor Lederman. That dipper was for you, Tim.

As long as we are on the topic of unneeded power in obsolete engines, what's the max overbore on a dipper 235? And how many cubic inches would it translate to?

Last edited by JW51; Sat Aug 12 2017 08:04 PM.

#1229760 - Sat Aug 12 2017 08:08 PM Re: Question for Engine Purchase [Re: youngclassicfan]  
Volfandt  Offline
Joined: Aug 2012
Posts: 939
Knox County, TN
The 216 in my 49 leaks oil out of every seal it's got, has blowby so bad that I smell like I've been working all day in an oil refinery after a 1/2 hr cruise, needs to be down shifted to 2nd on steep hills and rarely hits 13 mpg and with all that said I still can't make myself swap it out with a freshly rebuilt full pressure 235 collecting dust in the corner of my shop.

I even get these strange thoughts whilst on my extended cruises on pulling it out and attempting to stop all the leaks, and perhaps some new rings and mains to stop the blowby and increase the oil pressure (which avg's 7 psi when warmed).
I figure I must be breathing too much blowby LOL...


#1229761 - Sat Aug 12 2017 08:15 PM Re: Question for Engine Purchase [Re: youngclassicfan]  
Hotrod Lincoln  Online
Extreme Gabster
Joined: Feb 2004
Posts: 14,971
Dellrose, TN
A 235 has a 3 9/16" bore size, and it can take a 60 thousandths overbore comfortably. I've even seen a few go 80 over, but I think that's pushing the envelope a little. A 60 overbore would probably gain about 7-8 cubic inches, just as a wild guess, not enough to really affect compression or power a noticeable amount, IMHO.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

#1229837 - Sun Aug 13 2017 12:20 PM Re: Question for Engine Purchase [Re: youngclassicfan]  
Paul_WNC  Offline
Shop Shark
Joined: Nov 2011
Posts: 1,409
North Carolina
Well I guess this thread has digressed to random engine trivia, I guess my submission is okay... the original poster wants to learn about engines anyway.

The first year the low oil pressure 235 went into production was 1941, and only in the WW2 military trucks. Below is an image of a very similar 1942 235, notice the unique deep sump oil pan. Also notice the oil pan actually has "235" stamped on it.

[img]http://www.surfacezero.com/g503/data/3285/medium/IMG_19215.JPG[/img]

Last edited by Paul_WNC; Sun Aug 13 2017 12:23 PM.

#1229839 - Sun Aug 13 2017 12:38 PM Re: Question for Engine Purchase [Re: youngclassicfan]  
Hotrod Lincoln  Online
Extreme Gabster
Joined: Feb 2004
Posts: 14,971
Dellrose, TN
Paul, that site is asking for a password- - - - -can you make it "general access" instead of members only?
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

#1229844 - Sun Aug 13 2017 12:44 PM Re: Question for Engine Purchase [Re: Hotrod Lincoln]  
Paul_WNC  Offline
Shop Shark
Joined: Nov 2011
Posts: 1,409
North Carolina
Originally Posted by Hotrod Lincoln
Paul, that site is asking for a password- - - - -can you make it "general access" instead of members only?
Jerry

Hmm, stand by


#1229845 - Sun Aug 13 2017 12:49 PM Re: Question for Engine Purchase [Re: youngclassicfan]  
Paul_WNC  Offline
Shop Shark
Joined: Nov 2011
Posts: 1,409
North Carolina
Try it now...let me know if it works.


#1229859 - Sun Aug 13 2017 02:10 PM Re: Question for Engine Purchase [Re: youngclassicfan]  
JW51  Online
Shop Shark
Joined: Jan 2014
Posts: 904
Missouri
Never seen that oil pan. Was that a military thing?


#1229861 - Sun Aug 13 2017 02:34 PM Re: Question for Engine Purchase [Re: youngclassicfan]  
Hotrod Lincoln  Online
Extreme Gabster
Joined: Feb 2004
Posts: 14,971
Dellrose, TN
That oil pan is definitely a military thing- - - -none of the 235's that were paired up with Powerglide transmissions from 1950 forward had anything anything like that. They did have "235" stamped into the pan in big numbers to prevent a mismatch with a 216 oil pan. The measurements for checking rod dipper and oil pan trough position were definitely different, and required the use of a different checking fixture.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

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