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> Corvair engine swap, Tell me why this isn't popular
914rat
post Feb 17 2011, 11:13 AM
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I saw a car in the classifieds that has a Corvair 6 engine swap with the engine set up to run in the correct dirrection.I was wondering why we don't see this conversion very often.Seems like a pretty straight forward conversion.
http://www.914world.com/bbs2/index.php?showtopic=114974
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gandalf_025
post Feb 17 2011, 10:34 PM
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I started driving Corvair turbo's in the mid 70's. Put the 6 up for the winters and drove the Corvair
.060 forged pistons and a Chevy 409 Oil Pump. Total Seal Rings and a big E-Flow turbo, Weber 2 barrel 40DCOE Carb, Water Injection.. Fun highway car.

They are known for dropping valve seats and beating them into the Piston tops and spitting the pieces down the exhaust, into the turbo. makes quite a mess.
I have seen a fix where they "stake " the valve seats into the heads though.

Stock, I don't think they turn any serious revs, around 5500 RPM.. I'm sure that could be addressed.. An upright 911 type fan would be help keep the belt on.

The setup the DR. has with the big bore VW P/C's sounds like the way to go.

Also, the 3 barrel Weber setup used 140HP big Valve heads. You machine off the existing manifolds from the heads and buy adapters. Not cheap to buy, But the machining work is nothing beyond what I have seen some members here do on a daily basis.

Cheap to buy and build compared to Porsche Engines and many parts available, including roller rockers and big turbo's.

I'm just finishing selling off the last of my Corvair Stuff.. Been holding on to it for years and I just came to the point where i'm never going to build another one.

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jd74914
post Feb 18 2011, 07:40 AM
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QUOTE(gandalf_025 @ Feb 17 2011, 11:34 PM) *

They are known for dropping valve seats and beating them into the Piston tops and spitting the pieces down the exhaust, into the turbo. makes quite a mess.
I have seen a fix where they "stake " the valve seats into the heads though.

Stock, I don't think they turn any serious revs, around 5500 RPM.. I'm sure that could be addressed.. An upright 911 type fan would be help keep the belt on.


A friend of mine has a Monza with a built motor, and had the same seat issues until rebuilding both heads "correctly." The cool part is that pretty much all of the parts are dirt cheap and readily available. The motors are super easy to build as well.

He used to run around with IROC wheels and headers with short glasspacks; it turns lots of heads, but is a super obnoxious car and you need earplugs after any amount of time. Not too bad for a bunch of college kids! (IMG:style_emoticons/default/laugh.gif)
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Posts in this topic
914rat   Corvair engine swap   Feb 17 2011, 11:13 AM
pt_700   i suspect it's because there's not a lot o...   Feb 17 2011, 11:19 AM
9146986   The Porsche flat 6 (depending on the engine) can b...   Feb 17 2011, 11:27 AM
SirAndy   The Corvair engine is probably too rare to be popu...   Feb 17 2011, 02:58 PM
SirAndy   The Corvair engine is probably too rare to be popu...   Feb 17 2011, 07:22 PM
914rat   [quote name='SirAndy' post='1432761' date='Feb 17...   Feb 17 2011, 09:49 PM
914rat   The Corvair is much less expensive to purchase tha...   Feb 17 2011, 02:11 PM
zymurgist   Perhaps Dr Evil will chime in. He has a Corvair en...   Feb 17 2011, 02:22 PM
carr914   Your values on Porsche 911 Cores are way off. Plus...   Feb 17 2011, 02:23 PM
914rat   Your values on Porsche 911 Cores are way off. Plu...   Feb 17 2011, 02:50 PM
toon1   The Corvair is much less expensive to purchase th...   Feb 17 2011, 03:08 PM
914rat   The Corvair is much less expensive to purchase t...   Feb 17 2011, 03:40 PM
mepstein   I wanted a Porsche engine in my Porsche 914.   Feb 17 2011, 03:31 PM
zymurgist   I thought it was a good question. Not everybody re...   Feb 17 2011, 03:46 PM
r_towle   to rare IMHO equals a small market for parts, litt...   Feb 17 2011, 04:00 PM
Dr Evil   I am too busy to read the negative comments that t...   Feb 17 2011, 04:10 PM
bandjoey   I always thought it was poo pooed because it was a...   Feb 17 2011, 04:31 PM
tornik550   This stuff happens too often here- somebody asks a...   Feb 17 2011, 04:51 PM
RJMII   my answer: Ralph Nader. Personally if I were goi...   Feb 17 2011, 04:54 PM
toon1   [quote name='toon1' post='1432766' date='Feb 17 2...   Feb 17 2011, 06:48 PM
Dr Evil   I was doing a conversion on my 914 until a 2.7 dro...   Feb 17 2011, 06:51 PM
rick 918-S   I was doing a conversion on my 914 until a 2.7 dr...   Feb 17 2011, 07:04 PM
carr914   Your values on Porsche 911 Cores are way off. Pl...   Feb 17 2011, 06:57 PM
Lennies914   I built a corvair 7 years ago. It can get expensiv...   Feb 17 2011, 07:03 PM
GS Guy   I'm sure you'd get some serious double-tak...   Feb 17 2011, 07:24 PM
scotty b   I'm sure you'd get some serious double-ta...   Feb 17 2011, 09:41 PM
9146986   I'm not a big fan of the Corvair fan belt set ...   Feb 17 2011, 07:32 PM
BIGKAT_83   I'm not a big fan of the Corvair fan belt set...   Feb 17 2011, 07:42 PM
gandalf_025   I started driving Corvair turbo's in the mid 7...   Feb 17 2011, 10:34 PM
jd74914   They are known for dropping valve seats and bea...   Feb 18 2011, 07:40 AM
dion9146   I've got a funny, slightly OT story about a Co...   Feb 18 2011, 06:22 AM
Dr Evil   I have 140, tri ported heads that are going on my ...   Feb 18 2011, 06:31 AM
Don M   Built dozens of these years ago, used mostly 140hp...   Feb 18 2011, 08:51 AM
Dr Evil   I am shooting for 8.5:1, last was 8.3:1. I will po...   Feb 18 2011, 10:38 AM
Vacca Rabite   When I am done with my truck, I am considering a c...   Feb 18 2011, 10:44 AM
914rat   After reading the build thread and looking @ the p...   Feb 18 2011, 03:43 PM
KELTY360   After reading the build thread and looking @ the ...   Feb 18 2011, 06:51 PM
RJMII   I hope I'm not listed in that group. If so,...   Feb 18 2011, 05:39 PM
RJMII   Sure, it could be a good topic, if you remember ...   Feb 18 2011, 05:42 PM
vsg914   I dont know jack about a corvair, and dont care, b...   Feb 18 2011, 07:06 PM
Gearhead1432   If I end up doing a conversion, it will probably b...   Feb 18 2011, 09:16 PM
Dr Evil   If I end up doing a conversion, it will probably ...   Feb 18 2011, 10:49 PM
spankmeister7   Funny that this should come up right now because j...   Feb 19 2011, 12:59 AM
Brett W   I inspected and drove the Corvair powered car in t...   Feb 18 2011, 09:26 PM
carr914   I'm afraid the gene pool on this site is gett...   Feb 19 2011, 04:45 AM
914rat   I'm afraid the gene pool on this site is get...   Feb 19 2011, 03:54 PM
gandalf_025   If I was going to do a conversion of this type.. ...   Feb 19 2011, 06:37 AM
RJMII   the helical cut of the gears is going the wrong...   Feb 19 2011, 09:30 AM
John Jentz   the helical cut of the gears is going the wron...   Feb 19 2011, 09:47 AM
RJMII   the helical cut of the gears is going the wro...   Feb 19 2011, 10:35 AM
Dr Evil   Ya, the engine turning the wrong way will always t...   Feb 19 2011, 01:43 PM
d914   :wttc: :flag1: :D   Feb 19 2011, 03:41 PM
Gearhead1432   GM designed the Corvair engine to rotate "bac...   Feb 19 2011, 03:52 PM
Dr Evil   "After 5 years and 200 posts I guess I finall...   Feb 19 2011, 04:50 PM
pt_700   i think it's awesome the way this thread has s...   Feb 19 2011, 06:33 PM
RJMII   :beer2: Good job on the new thread. :) I...   Feb 19 2011, 08:11 PM
Gint   http://www.914world.com/bbs2/uploads/post-179-1258...   Feb 20 2011, 07:46 AM


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