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Dstolan83 Samba Member
Joined: August 07, 2020 Posts: 125
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Posted: Sun Sep 25, 2022 2:51 pm Post subject: “Dead Heading “ of air in engine bay |
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I live in Las Vegas desert and daily my Mild 1776 and this is the second summer that I have had issues with “over heating “ and having engine problems. I have factory tins and my seal is new . My bug is a 67 , so it only has the one long vent under the window and as it warms up I install a lid stand off kit . I run 30w VR1 oil, believe I have 26mm oil pump no cooler other than the factory dog house . It seems to me like I am just dead heading all the air and turning my engine bay into a big convection oven. Any suggestions? I have thought about knack A ducts or changing the lid to a later year that has venting on it .
Thanks for your thoughts . |
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vwracerdave Samba Member
Joined: November 11, 2004 Posts: 15280 Location: Deep in the 405
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Posted: Sun Sep 25, 2022 3:08 pm Post subject: Re: “Dead Heading “ of air in engine bay |
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With the deck lid stand-offs, you should have plenty of ventilation.
What compression ratio is your engine and what octane gas do you run? _________________ 2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK
Featured in Dec. 2001 HOT VW's Magazine page 63
Watch my racing video's http://www.youtube.com/user/okvwracer/videos |
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busdaddy Samba Member
Joined: February 12, 2004 Posts: 51057 Location: Surrey B.C. Canada, but thinking of Ukraine
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Posted: Sun Sep 25, 2022 3:11 pm Post subject: Re: “Dead Heading “ of air in engine bay |
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Just what is your idea of "over heating"? _________________ Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
Слава Україні! |
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Dstolan83 Samba Member
Joined: August 07, 2020 Posts: 125
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Posted: Sun Sep 25, 2022 5:02 pm Post subject: Re: “Dead Heading “ of air in engine bay |
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I am seeing head temps upwards of 500 degrees.
I run 91 pumped gas. I have to re run the math for compression but heads are 54 cc deck height is .006 which should be close to 9-1 . |
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MURZI Samba Member
Joined: August 25, 2005 Posts: 5063 Location: Madisonville, La
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Posted: Sun Sep 25, 2022 5:50 pm Post subject: Re: “Dead Heading “ of air in engine bay |
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.006 deck height is your problem. No no no.
Install a .040 copper head shim and you should be golden. _________________ 62 vert
2276
Tim’s welded heads
45 Dells
A1 sidewinder
Fk44 cam |
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b-man Samba Member
Joined: May 20, 2008 Posts: 498 Location: So Cal
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Posted: Sun Sep 25, 2022 5:52 pm Post subject: Re: “Dead Heading “ of air in engine bay |
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Dstolan83 wrote: |
I am seeing head temps upwards of 500 degrees.
I run 91 pumped gas. I have to re run the math for compression but heads are 54 cc deck height is .006 which should be close to 9-1 . |
500 degrees is over a hundred past where they’re going to start cracking.
Usually the tightest deck you can get away with is about .035” with .040” being preferred. Your pistons are probably kissing the heads being at .006”.
On the subject of deck lids you’re not going to be able to use anything but a 1967 convertible deck lid if you want additional air, earlier and later lids won’t fit in place of that one year only ‘67 lid. _________________ 1956 Dove Blue Panel
1966 Velvet Green Single Cab
1957 L41 Black Oval Window Beetle |
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67rustavenger Samba Member
Joined: February 24, 2015 Posts: 9665 Location: Oregon
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Posted: Sun Sep 25, 2022 6:18 pm Post subject: Re: “Dead Heading “ of air in engine bay |
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b-man wrote: |
Dstolan83 wrote: |
I am seeing head temps upwards of 500 degrees.
I run 91 pumped gas. I have to re run the math for compression but heads are 54 cc deck height is .006 which should be close to 9-1 . |
500 degrees is over a hundred past where they’re going to start cracking.
Usually the tightest deck you can get away with is about .035” with .040” being preferred. Your pistons are probably kissing the heads being at .006”.
On the subject of deck lids you’re not going to be able to use anything but a 1967 convertible deck lid if you want additional air, earlier and later lids won’t fit in place of that one year only ‘67 lid. |
And damn near impossible to find. If you do, expect to pay handsomely for it.
Ask me how I know.
My 67 vert decklid, IS NOT FOR SALE!
IDK if Dr. Decklid is still modifying decklids. But he would be a less expensive solution to finding an OG 67 vert decklid. _________________ I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo!
Last edited by 67rustavenger on Sun Sep 25, 2022 6:19 pm; edited 1 time in total |
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modok Samba Member
Joined: October 30, 2009 Posts: 26743 Location: Colorado Springs
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Posted: Sun Sep 25, 2022 6:19 pm Post subject: Re: “Dead Heading “ of air in engine bay |
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I would say remove the front tin, the part across right under the firewall, and see if that helps. Easiest way to test your deadhead theory, which, is certainly true to a degree.
I've seen no real preference to how to vent the engine lid, some prop open the top, some prop open the bottom, or both, or others the vent behind the license plate.
I SUSPECT it makes no difference at all what you do with the lid, I bet they work equally.
But you probably have something else going on, belt slipping on overheated aluminum pulley, or excessively tight piston to wall clearance, or exhaust tuning problems cruising right in the bad spot, the dreaded .080 deck, too lean, or too rich and overadvanced timing, or glowing exhaust valves, or not enough octane, or geared wrong, Fins blocked with flash, fuel preheated, or carbs too hot, or something like that.
I may not have still missed it with that shotgun, but it's usually what you DON'T see that's hurting you, know what I mean?
Lots of VW run too hot and benefit from additional venting, but a lot of them run cool enough to close the lid. Every single part can be a contributor to that. |
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67rustavenger Samba Member
Joined: February 24, 2015 Posts: 9665 Location: Oregon
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Posted: Sun Sep 25, 2022 6:43 pm Post subject: Re: “Dead Heading “ of air in engine bay |
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OP, how are you measuring your head temps?
With a thermocouple?
Or an infrared temp gun?
If the gun is used. Where are you aiming it to get your head temps? _________________ I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo! |
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Dstolan83 Samba Member
Joined: August 07, 2020 Posts: 125
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Posted: Sun Sep 25, 2022 7:33 pm Post subject: Re: “Dead Heading “ of air in engine bay |
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Modok, I think you hit it right on. I know that having a “Rich” motor is what killed my new one. I washed the rings out. Lost all compression with no catastrophic failure, once the temperature got above 70 degrees average.
Over the summer I have cleaned the porting up on my heads installed a new exhaust system so that I can have a wide band O2 and monitor my AFR . Installed new rings and honed my jugs.
So getting back the question, what you guys are saying is that Dead heading is not an issue with bugs. |
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Dstolan83 Samba Member
Joined: August 07, 2020 Posts: 125
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Posted: Sun Sep 25, 2022 7:49 pm Post subject: Re: “Dead Heading “ of air in engine bay |
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And to fix my typo and reran the Jbugs calculator
90.5 bore
69 stroke
Heads cc 54
Deck height 0.06
Compression 8 to 1
I was taking temps with a Milwaukee temp gun with the laser on heads from underneath the car as far from the exhaust as possible..
thanks for the responses it is all good information. |
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chrisflstf Samba Member
Joined: February 10, 2004 Posts: 3413 Location: San Diego
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Posted: Sun Sep 25, 2022 8:05 pm Post subject: Re: “Dead Heading “ of air in engine bay |
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Tstat, flaps working? |
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oprn Samba Member
Joined: November 13, 2016 Posts: 12633 Location: Western Canada
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Posted: Mon Sep 26, 2022 6:01 am Post subject: Re: “Dead Heading “ of air in engine bay |
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Stock pulleys? Power pulley? Correct fan for the dog house shroud? Firewall insulation loose and being sucked into the fan? What is your AFR reading and timing at cruise? _________________ We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age) |
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slalombuggy Samba Member
Joined: July 17, 2010 Posts: 9131 Location: Canada
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Posted: Mon Sep 26, 2022 9:56 am Post subject: Re: “Dead Heading “ of air in engine bay |
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Try swapping to a non synthetic oil like Lucas. When I tried synthetic oil in my engine, oil temp went down but engine temps went up. Synthetic does not absorb heat like conventional oil. It may not solve the problem but it may help.
If you have stand offs you have something going on as stated above, slipping belt, loose insulation, fan, internal friction. |
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Dstolan83 Samba Member
Joined: August 07, 2020 Posts: 125
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Posted: Mon Sep 26, 2022 2:05 pm Post subject: Re: “Dead Heading “ of air in engine bay |
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It is a conventional just has a zinc additive |
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johnstrive4 Samba Member
Joined: April 24, 2022 Posts: 20 Location: Sinsouttercity
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Posted: Mon Oct 10, 2022 8:08 pm Post subject: Re: “Dead Heading “ of air in engine bay |
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OH. YEA Sounds like SOME KILLER BUDS be messing witcha.
Weed may be good for some. And by others comments ,
Sounds like you got the good STRAIN. WEED dude VW!
Been out in Temps over 120 deg at idle in traffic Head temp 290 , oil temp 220.
500 deg! You preheat metal to weld at that temp. Quit playing. |
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rayjay Samba Member
Joined: March 26, 2008 Posts: 1501 Location: Buford GA
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Posted: Tue Oct 11, 2022 2:53 am Post subject: Re: “Dead Heading “ of air in engine bay |
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I think you need a cht gauge with a bolt on thermocouple. |
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RWK Samba Member
Joined: June 24, 2009 Posts: 1337 Location: S.W. MI
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Posted: Tue Oct 11, 2022 5:54 am Post subject: Re: “Dead Heading “ of air in engine bay |
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key missing/sheered on the generator pulley? seen that a few times. _________________ 73 Type 181
63 Type 113
63 Type 261- 428 071
62 Type 241-378 025 178 530 |
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