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Jul 21st, 2025 | | 
#59469 04/21/2006 4:09 PM | Joined: Mar 2000 Posts: 784 'Bolter | | 'Bolter Joined: Mar 2000 Posts: 784 | Should I expect to have to retune my 235 after I install a PCV valve. I have it installed and the engine seems to run fine (at least in the garage). I haven't had a chance to give it a road test yet.
Any comments or suggestions are welcome.
George | | |
#59470 04/21/2006 10:31 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | You should readjust the idle mixture. The cruising & power systems will probably be OK. You will know after a road test.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#59471 04/22/2006 10:21 PM | Joined: Oct 2004 Posts: 235 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2004 Posts: 235 | 46,
Wrenchbender is spot on. When I installed a pcv in my 41 I just had to lean out the idle mixture a little. Runs great.
Cheers
Bob | | |
#59472 04/23/2006 1:45 AM | Joined: Aug 2002 Posts: 455 Shop Shark | | Shop Shark Joined: Aug 2002 Posts: 455 | Depends on your valve and how much manifold vacuum drop it causes at idle.
I found the Deutsch PCV125 had the lowest drop of only 3" at idle, but still enough suction to excavate the crankcase gases.
You hardly have to adjust your carbs at all with this valve.
Also stays more open at high rpm and cruising.
Vacuum wiper motors work also better.
The pcv valves recommended in the new books seem too tight for the 235.
They lose almost all manifold vacuum already at idle and start shutting off too soon at part throttle. | | |
#59473 04/24/2006 4:06 PM | Joined: Mar 2000 Posts: 784 'Bolter | | 'Bolter Joined: Mar 2000 Posts: 784 | Thanks guys. I leaned out the carbs a little this weekend. Seems to run great.
George | | |
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