Re: [vintagvw] Porcelain coating redux
Guys, Let's think a minute here. The engine compartment is filled with air containing heat. You are pulling that(and fresh air) straight thru the fan and distributing it around the inside of the shroud at a pretty high rate. The sheet metal is going to be mostly the temperature of the air being pulled in by the fan and blown thru the shroud at high speed(lots of cfm). I would bet that the temp of the shoud itself would closely match the ambient engine compartment air temperature. I don't see that the coating on the shroud would help at all. Now, a coating on the inside of the cylinder head/cylinder sheet metal might do some good. Just my 2 cents, dave On Sat, 18 Apr 2015, Kyle Davis wrote: What I was thinking, and I guess it is wrong, would be that porcelain coating the fan shroud would keep heat out of the cooling system, not vice versa. Kyle -- Visit the VintagVW archives at http://www.mail-archive.com/vintagvw@googlegroups.com --- You received this message because you are subscribed to the Google Groups VintagVW - Air Cooled Volkswagen Discussion List group. To unsubscribe from this group and stop receiving emails from it, send an email to vintagvw+unsubscr...@googlegroups.com. To post to this group, send email to vintagvw@googlegroups.com. Visit this group at http://groups.google.com/group/vintagvw. For more options, visit https://groups.google.com/d/optout.
Re: [vintagvw] Porcelain coating redux
Original VW engine sheet metal was painted s semigloss black, probably because it was durable and inexpensive. If the fan and control vanes are working properly, the cylinder tin ought to never get hot enough to burn you - at least that's been my experience in Northern Illinois and southern Wisconsin. When I built my engines, I always gave the cylinder fins a single coat of black enamel. No data on if it helped or hurt, but it looked nicer than rusty iron when I had to go into the motor later on. I've never had an engine overheat except when the firewall insulation came loose and got sucked into the fan once. Chuck Kuecker On 4/19/2015 9:39 AM, No Quarter wrote: We discussed thing a long time ago on the list and I think it was our beloved Bob Hoover that did tests with chrome, paint of different colours, and then subsequent temperature testing and it was found that satin black finishes such as from paint kept the coolest temperatures. Flat black paint on the heads may have been the study I'm thinking of. Ah well blow it - my memory ain't waht it used to be! There was some scientific reasoning behind it though. Temperature samples were done with one of those laser gadgets where you point-and-shoot. I was thinking the temp drop was 5 degrees, but that 5 degrees coupled with everything else such as properly jetted carburetor, thermostat, adequate air-flow, proper timing, etc. were the overall key to keeping the engine cool. You start ignoring the small temperature savings here and there and it ads up to a nice burned out engine that still looks with the chrome on it (with a blue tinge from overheating) LOL! In the end it's your car and you run it the way you want. You just have to decide how long you want it to run. If you like rebuilding engines annually or even monthly, use lots compression, no thermostat, no Hoover bit, stale air shrouds - in chrome - no bottom tins and no tin between the cylinders on the bottom (because who needs 'em! BAH!), and large P/C combos , cast stroker cranks in an align-bored AS41, HUGE cams, and go have fun! You eventually start to envy the grandma who can start up her stock VW and go for a leisurely Sunday drive and has time to water her flowers. You won't have time to think while she does. LOL! NQ - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2250 / Virus Database: 4311/9072 - Release Date: 04/19/15 -- Visit the VintagVW archives at http://www.mail-archive.com/vintagvw@googlegroups.com --- You received this message because you are subscribed to the Google Groups VintagVW - Air Cooled Volkswagen Discussion List group. To unsubscribe from this group and stop receiving emails from it, send an email to vintagvw+unsubscr...@googlegroups.com. To post to this group, send email to vintagvw@googlegroups.com. Visit this group at http://groups.google.com/group/vintagvw. For more options, visit https://groups.google.com/d/optout.
Re: [vintagvw] Porcelain coating redux
We discussed thing a long time ago on the list and I think it was our beloved Bob Hoover that did tests with chrome, paint of different colours, and then subsequent temperature testing and it was found that satin black finishes such as from paint kept the coolest temperatures. Flat black paint on the heads may have been the study I'm thinking of. Ah well blow it - my memory ain't waht it used to be! There was some scientific reasoning behind it though. Temperature samples were done with one of those laser gadgets where you point-and-shoot. I was thinking the temp drop was 5 degrees, but that 5 degrees coupled with everything else such as properly jetted carburetor, thermostat, adequate air-flow, proper timing, etc. were the overall key to keeping the engine cool. You start ignoring the small temperature savings here and there and it ads up to a nice burned out engine that still looks with the chrome on it (with a blue tinge from overheating) LOL! In the end it's your car and you run it the way you want. You just have to decide how long you want it to run. If you like rebuilding engines annually or even monthly, use lots compression, no thermostat, no Hoover bit, stale air shrouds - in chrome - no bottom tins and no tin between the cylinders on the bottom (because who needs 'em! BAH!), and large P/C combos , cast stroker cranks in an align-bored AS41, HUGE cams, and go have fun! You eventually start to envy the grandma who can start up her stock VW and go for a leisurely Sunday drive and has time to water her flowers. You won't have time to think while she does. LOL! NQ -- Visit the VintagVW archives at http://www.mail-archive.com/vintagvw@googlegroups.com --- You received this message because you are subscribed to the Google Groups VintagVW - Air Cooled Volkswagen Discussion List group. To unsubscribe from this group and stop receiving emails from it, send an email to vintagvw+unsubscr...@googlegroups.com. To post to this group, send email to vintagvw@googlegroups.com. Visit this group at http://groups.google.com/group/vintagvw. For more options, visit https://groups.google.com/d/optout.
