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Jim Ratto
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« Reply #30 on: February 20, 2008, 17:18:36 pm » |
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I looked this up in the old VW service book....for 40HP motors with old round boss 1200 heads....VW suggested drilling 10mm holes (6) in the ribs that extended from above rocker cover rail (upper) to outward most fin. It was done to lower head temperature and reduce pinging on heavily loaded motors.
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Harry/FDK
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« Reply #31 on: February 20, 2008, 18:08:43 pm » |
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Johannes, Eugene and Jim, thanks for the input. As Jim knows i'm currently rebuilding my 2165 engine. It's getting VERY tempting to do some calculations and have the Heads under the drillpress. Thanks, Harry And Jim, be carefull with that axe as well  |
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eugene
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« Reply #32 on: February 20, 2008, 18:31:39 pm » |
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Now i know which manual you mean. I have made a scan of the page:  But i think those holes were drilled to allow more air to pass to the exhaust port. Biger- 10mm, holes because of this. |
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Harry/FDK
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« Reply #33 on: February 20, 2008, 19:20:47 pm » |
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I'm just a hobby wrencher, but when i started this topic, i had the feeling that it makes sense to drill through the fins around the bottom of the head (combustion chamber side), all the way through the 7th fin. (I have 044's). And with your input the holes should be at 2-3 mm. What do you think?
Thanks/Regards,
Harry
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« Last Edit: February 20, 2008, 19:24:28 pm by FDK/Hurry »
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Harry/FDK
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« Reply #34 on: February 20, 2008, 22:36:25 pm » |
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And thinking about drilling the upper cylinder fin (s) as well.
Regards,
Harry
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eugene
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« Reply #35 on: February 21, 2008, 07:00:40 am » |
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Get an old head , put it on an electric owen with the cyl. side down, cover it with the tin and use a cold source of air to blow air trough the slot the shroud is blowing it. Take temp readings when the temp have stabilized. Then drill the head and repeat the procedure as close as possible. If the temps are cooler the procedure of drilling holes shall be known as the Hurry mod.  Regards iztok |
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Type1/DVK
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« Reply #36 on: February 21, 2008, 10:14:21 am » |
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probably to cool the mixture better, like a intercooler.. but this time with drilled holes  |
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DDD#8 - 14.74sec @ 1776cc - Member of: DVK ~ Der Vollgas Kreuzers - www.ultimatevw.nl - and racing engines |
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Harry/FDK
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« Reply #37 on: February 21, 2008, 17:54:34 pm » |
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Iztok, |
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SlingShot
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« Reply #38 on: February 23, 2008, 20:52:12 pm » |
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Very interesting topic, I wish I had time to experiment myself. I do know Porsche heads cool way better then a VW, thanks to a lot more fins= surface area. As far as drilling holes straight through, I don't believe that will work. Possibly at an angle though, that would give you an ellipsed hole, which would be more surface area than straight, and also more work.
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Will Race For Beer !!!
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Lids
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« Reply #39 on: February 24, 2008, 11:03:10 am » |
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i think these holes are not designed to increase surface area merely to allow more air over the exhaust port, as the fins blocking this now have a gap to let the air through
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SlingShot
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« Reply #40 on: February 24, 2008, 21:09:08 pm » |
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i think these holes are not designed to increase surface area merely to allow more air over the exhaust port, as the fins blocking this now have a gap to let the air through
Whoops, I guess next time I should look at the pictures |
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Will Race For Beer !!!
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Harry/FDK
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« Reply #41 on: February 28, 2008, 18:28:26 pm » |
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Couldn't Resist The Temptation..
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« Last Edit: February 28, 2008, 20:16:41 pm by FDK/Hurry »
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Diederick/DVK
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« Reply #42 on: February 28, 2008, 19:41:50 pm » |
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wow, those heads look pretty perforated!!
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Diederick
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Proud member of:
DVK ~ Der Vollgas Kreuzers
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Lee.C
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« Reply #43 on: February 28, 2008, 19:59:38 pm » |
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There is one thing that people seem to have over looked in this thread - That is that its not just surface area that diserpates heat its the amount of material itself - so if you start removing "material" then there is less of it to diserpate that heat. I wont be drilling mine thats for sure - just my 2 cents  |
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You either "Get It" or you don't......
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Jon
Administrator
Hero Member
Posts: 3214
12,3@174km/t at Gardermoen 2008
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« Reply #44 on: February 29, 2008, 10:18:37 am » |
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Cool Hurry! At least I hope so |
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Grumpy old men have signatures like this.
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Harry/FDK
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« Reply #45 on: February 29, 2008, 12:25:40 pm » |
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Type1/DVK
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« Reply #46 on: February 29, 2008, 14:32:42 pm » |
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wow dude, that's nice! hope it will work! but how are you going to know íf it will work??
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DDD#8 - 14.74sec @ 1776cc - Member of: DVK ~ Der Vollgas Kreuzers - www.ultimatevw.nl - and racing engines |
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Harry/FDK
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« Reply #47 on: February 29, 2008, 15:34:04 pm » |
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There's something called a cyl.head temp gauge.  |
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Type1/DVK
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« Reply #48 on: February 29, 2008, 16:19:00 pm » |
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There's something called a cyl.head temp gauge. i know but do you have refrence to old vs. new? with exactly the same ambient temps/humidity and so? to make it a good comparison.. |
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DDD#8 - 14.74sec @ 1776cc - Member of: DVK ~ Der Vollgas Kreuzers - www.ultimatevw.nl - and racing engines |
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Harry/FDK
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« Reply #49 on: February 29, 2008, 18:08:23 pm » |
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Lets say i have a lot of references from the past. (did my homework).
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Harry/FDK
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« Reply #50 on: March 01, 2008, 21:48:48 pm » |
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Cool Hurry! At least I hope so With some Revestreker Decalls it will run cooler... |
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alex d
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« Reply #51 on: March 03, 2008, 10:30:26 am » |
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an interesting test would be to watch a running engine with one of those IR cams, I'm sure we would see the hot spots that need help PS: I've been without internet all last week, I see someone posted that picture for me |
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