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Re: Is a 261 worth the trouble?
JW51 #1416922 Wed Jul 14 2021 03:32 AM
Joined: Feb 2004
Posts: 23,008
H
'Bolter
One sleeve costs a lot less than a whole set of oversize pistons. If you decide you want it, my boring equipment loves to travel!
Jerry


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Re: Is a 261 worth the trouble?
JW51 #1417104 Thu Jul 15 2021 08:36 PM
Joined: Aug 2015
Posts: 18
Y
'Bolter
I am no expert on these, but was under the impression that the 235 was a splash oil system, and the 261 actually had a circulating oil system. So, my ASSumption has been that the 261 would last longer. Please correct me if I am wrong.

Re: Is a 261 worth the trouble?
JW51 #1417106 Thu Jul 15 2021 08:43 PM
Joined: Dec 2001
Posts: 15,532
'Bolter
The 235, if my memory is correct, was pressure oil in powerglide 53 chevy cars for sure.

The 261, if my memory is correct, came out in only the two ton trucks utilizing the cam shaft from the early corvette to help with torque in the trucks..... I think.
I have a 261 i built in my 50 chevy coupe and while it is not on the road yet the engine sure runs sweet up and down my street and I've had the 216's/235's ect.


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Re: Is a 261 worth the trouble?
JW51 #1417125 Thu Jul 15 2021 10:13 PM
Joined: Dec 2008
Posts: 1,625
P
'Bolter
235 was a splash oil system, and the 261 actually had a circulating oil system
All 216 and earliest 235 have splash to the rod bearings. Later 235 and all 261 have pressure to the rods.
All have pressure to the main bearings and oil recirculation.

a 261 increases displacement by almost 11% over a 235, no other single change you can make will do that.

Re: Is a 261 worth the trouble?
JW51 #1417144 Fri Jul 16 2021 01:27 AM
Joined: Sep 2001
Posts: 31,212
Bubba
The 216 and early 235 engines were directed spray lubrication (and dippers) that fed oil to the rods.

Later 235s and all 261 had fully closed engine lubrication systems.

Earlier engines were true splash oil systems.

here is a little documentation of stovebolt engine lubrication from 1948-1953 [1954advance-design.com]

here is a description of a full dipper lubrication of rod bearings [chevy.oldcarmanualproject.com] (directed open-flow of oil at higher RPMs)

here is a "splash oil" system - it has dippers but no directed spray [chevy.oldcarmanualproject.com]


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
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