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1959 235 blow by
#1363094 Mon Jun 01 2020 09:36 PM
Joined: Mar 2011
Posts: 100
S
Shop Shark
Hi, Has anybody installed a crankcase evacuation system on their 235 looking for pros and cons on this? Thanks Steve

Re: 1959 235 blow by
Steve1940 #1363125 Tue Jun 02 2020 01:49 AM
Joined: Dec 2008
Posts: 1,470
P
Shop Shark
crankcase evacuation system
Vacuum pump?
Exhaust connection?
PCV?

Re: 1959 235 blow by
Steve1940 #1363126 Tue Jun 02 2020 01:56 AM
Joined: Aug 2018
Posts: 247
D
Shop Shark
The factory had an RPO for commercial vehicles that added PCV for vehicles that wouldn't be on the highway for the most part (making the draft tube ineffective), and an optional kit (shown in the drawing for '55). Note in the image how tall the breather is that replaces the draft tube. It was designed to avoid pulling too much oil vapor into the intake system.

But sure, it can be done. Best bet is to keep the baffling of the draft tube in place, and modify for a 6 cylinder PCV valve (occasionally one of the NOS or used factory PCV set ups show up on eBay, but they are rare at this point). The valve cover should be sealed of course, if the engine has one with the breather slots (model year dependent), and a better inlet connection designed. Note the factory mod has a tube running from air cleaner to valve cover added for that.

Hope this helps!

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Re: 1959 235 blow by
Steve1940 #1363159 Tue Jun 02 2020 10:57 AM
Joined: Mar 2011
Posts: 100
S
Shop Shark
Thank you for the info on that A older gentleman said I should look into that to let more crankcase pressure out .

Re: 1959 235 blow by
Steve1940 #1363164 Tue Jun 02 2020 11:29 AM
Joined: Sep 2001
Posts: 30,303
ace skiver
Steve,

What year 235?

Does it have a road draft tube?

Have you inspected/cleaned the road draft tube?

If your engine has a non-clogged road draft tube, there should be no "engine/crankcase pressure".


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]
Re: 1959 235 blow by
Steve1940 #1363229 Tue Jun 02 2020 07:10 PM
Joined: Mar 2011
Posts: 100
S
Shop Shark
Hi Tim, It is a 1959 235 and has a road draft tube. I was planning to clean it today but have not got around to do it. Hope to do it tomorrow I will report back. Thanks Steve

Re: 1959 235 blow by
drdoug #1363271 Tue Jun 02 2020 11:28 PM
Joined: Oct 2015
Posts: 232
P
Shop Shark
Originally Posted by drdoug
The factory had an RPO for commercial vehicles that added PCV for vehicles that wouldn't be on the highway for the most part (making the draft tube ineffective), and an optional kit (shown in the drawing for '55). Note in the image how tall the breather is that replaces the draft tube. It was designed to avoid pulling too much oil vapor into the intake system.

But sure, it can be done. Best bet is to keep the baffling of the draft tube in place, and modify for a 6 cylinder PCV valve (occasionally one of the NOS or used factory PCV set ups show up on eBay, but they are rare at this point). The valve cover should be sealed of course, if the engine has one with the breather slots (model year dependent), and a better inlet connection designed. Note the factory mod has a tube running from air cleaner to valve cover added for that.

Hope this helps!

Drdoug . Please explain the need for the tube running from the valve cover to the air cleaner . I have a 261 with a similar pcv but not a tube to the valve cover . I do have a vented breather cap .

John

Last edited by panel fan; Tue Jun 02 2020 11:34 PM.

good planning is no substitute for dumb luck
Re: 1959 235 blow by
Steve1940 #1363273 Tue Jun 02 2020 11:43 PM
Joined: Feb 2004
Posts: 20,820
H
Boltergeist
John, either setup will work, as long as there's a way for air to get into the valve cover. After 1968, the "Clean Air Act" in the USA mandated "closed" ventilation systems that put air from the "clean" side of the air filter into the crankcase so there was no possibility of fumes from the crankcase getting into the atmosphere. GM's PCV setup in the 1950's did it to assure no "dirty" air could enter commercial engines and promote abrasive wear. If the vented oil filler cap has some type of filter built into it, the same thing will be accomplished.
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!
Re: 1959 235 blow by
panel fan #1363282 Wed Jun 03 2020 12:58 AM
Joined: Aug 2018
Posts: 247
D
Shop Shark
John, Jerry covered your question nicely. Either the "clean air" routed from the air cleaner to the valve cover, or a vented filler cap with internal filter will work just fine.

Doug

Re: 1959 235 blow by
Steve1940 #1363283 Wed Jun 03 2020 01:05 AM
Joined: Oct 2015
Posts: 232
P
Shop Shark
Thanks to you both for the clearing this up for me , I was clear on the what and the how but not the why !

John


good planning is no substitute for dumb luck
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