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exhaust manifolds hot 351w |
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428CobraJet 
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Joined: August-19-2016 Location: Houston Status: Offline Points: 54 |
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 Topic: exhaust manifolds hot 351wPosted: May-08-2018 at 3:59pm |
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wondering if my flow is enough on my engines...351w with crank driven water pumps into engine, thru thermostat to HiTek exhausts. the risers are more than warm. You can touch them but not leave your hand on them.
140 degree thermostat with 1/8 inch hole drilled. |
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You are what you drive.
1971 Nova24vdrive 1967 Arabian |
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Bri892001
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Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4945 |
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Posted: May-10-2018 at 11:21am |
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Start off here:
http://www.skidim.com/Faq_TROUBLESHOOT.asp#RWTS Post your results of the bucket test, and you should get some follow up advice. |
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Gary S
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Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Posted: May-10-2018 at 11:39am |
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I don't think you have a problem,I have the same exhausts on a PCM 302 and it feels hot too.. But then again so does my HM and my GT 40. Obviously a more accurate method would be better but I have never bothered to check mine as I don't think there is a problem. You cannot leave your hand on any of them.
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MourningWood
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Joined: June-13-2014 Location: NorCal Status: Offline Points: 885 |
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Posted: May-10-2018 at 11:46am |
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This may not address hot manifolds, but you're engine will probably be happier with a 160/170 t-stat. Maybe buy (or borrow) an Infra-red heat sensor and check manifolds. |
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1994 Ski Nautique "Riot"
1964 Dunphy X-55 "One 'N Dun" 'I measured twice, cut three times, and it's still too short!" |
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JoeinNY
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Joined: October-19-2005 Location: United States Status: Offline Points: 5693 |
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Posted: May-10-2018 at 11:59am |
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The crank mounted pump is a hint that this is not the PCM cooling setup that many of us are familiar with – who marinized the engine? Is there a circulation pump? Pictures would help, along with some better temp data. |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Posted: May-10-2018 at 12:10pm |
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Craig, ???? Is one of the 418's the engine????
BTW, I too have never found a engine that you can leave your hand on a exhaust manifold. |
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428CobraJet
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Posted: May-10-2018 at 12:47pm |
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it's a Holman Moody marinization. with crank mounted pumps.
maybe it's the thinness of the stainless headers. I'll look for my infrared gauge. and a photo! |
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You are what you drive.
1971 Nova24vdrive 1967 Arabian |
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JoeinNY
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Posted: May-10-2018 at 1:01pm |
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They likely wont run real cool, but if they are getting up there to boiling temps you are going to need to be careful for sure. If they are new strokers make sure you are not being too aggressive with the timing. 418s would need to much less total timing ( but possibly more intial timing) than a 351w and running them with a stock curve and too much timing will get everything hot - until it blows up.
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428CobraJet
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Posted: May-10-2018 at 2:02pm |
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I can touch them. I just can't sit on them.
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You are what you drive.
1971 Nova24vdrive 1967 Arabian |
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428CobraJet wrote: