Cam suggestions?
-
- Posts: 42
- Joined: Sat Jun 01, 2013 5:39 pm
- Location: Burlington, Ontario, Canada
Cam suggestions?
So I'm rebuilding my engine and I would like the forum's opinion on something.
The engine is a 65-66 180 turbo. The original cam is worn.
I don't care about fuel economy but I would like the motor to be dependable with maybe a bit more "oomph".
I would like to stay away from extensive extra head work too.
Should I go with an OTTO 10? 20? Or stay stock?
All suggestions welcome!
The engine is a 65-66 180 turbo. The original cam is worn.
I don't care about fuel economy but I would like the motor to be dependable with maybe a bit more "oomph".
I would like to stay away from extensive extra head work too.
Should I go with an OTTO 10? 20? Or stay stock?
All suggestions welcome!
1963 Spyder Convertible
-
- Posts: 20
- Joined: Sun Sep 29, 2013 5:26 pm
Re: Cam suggestions?
Stay stock. Turbo motors needed a special cam
Re: Cam suggestions?
^ Internet lore....
Turbocharged engines respond the same exact way to cams as a N/A engine, it's just that the positive manifold pressure tends to exaggerate things. Example, a cam having a 5500 RPM redline N/A will generally be extended another 1000 RPM on boost. If the compression is also lowered, the same engine will also idle a little rough depending on the amount of duration involved. YMMV.
I put an Isky turbo grind in mine, seems to work pretty well. But I've also used plenty of N/A cams in turbo VW engines and they work great, just make sure you really know what RPM range you're shooting for. OT-20 should work good, just don't get too low on the compression or you won't like the idle quality.
Turbocharged engines respond the same exact way to cams as a N/A engine, it's just that the positive manifold pressure tends to exaggerate things. Example, a cam having a 5500 RPM redline N/A will generally be extended another 1000 RPM on boost. If the compression is also lowered, the same engine will also idle a little rough depending on the amount of duration involved. YMMV.
I put an Isky turbo grind in mine, seems to work pretty well. But I've also used plenty of N/A cams in turbo VW engines and they work great, just make sure you really know what RPM range you're shooting for. OT-20 should work good, just don't get too low on the compression or you won't like the idle quality.
- flat6_musik
- Posts: 2659
- Joined: Sun Apr 04, 2010 10:03 am
- Location: Hesperia, CA
Re: Cam suggestions?
I installed an Otto TB-20 in mine. I like it, and it doesn't seem to suffer any weakness down low in the RPM range. (Darn it, I put OT-20 before and that was incorrect). Sorry.....
Last edited by flat6_musik on Fri Oct 04, 2013 9:13 pm, edited 2 times in total.
-
- Posts: 42
- Joined: Sat Jun 01, 2013 5:39 pm
- Location: Burlington, Ontario, Canada
Re: Cam suggestions?
Thanks for the suggestions. @flat6: what other, if any, upgrades did you have to make to run the 20 cam?
1963 Spyder Convertible
-
- Posts: 20
- Joined: Sun Sep 29, 2013 5:26 pm
Re: Cam suggestions?
In the 80's, Sig Erson who supplird cams for Otto Parts had five different "stages" of cams for normally
aspirated engines and another five for the turbocharged engines. Not much detail about these cams
was available in their catalog, kinda made the generalization that it was computer generated. But in
1975 only had five cams total, none stated for turbos.
They start out mild with a .430 lift and a 272 degree duration, (110H)
All out racing has .480 lift and .310 degree duration. (500H)
These are all hydraulic cams made by Sig Erson. Why they decided
to make cams for turbo, I don't know except possible with a standard
cam in a turbchrged engine.
Isky does make Corvair cams yet?
Howard, I don't know if they're around anymore made cams for Star Corvair and maybe
Kings.
I've seen specs for normally aspirated but no turbos.
aspirated engines and another five for the turbocharged engines. Not much detail about these cams
was available in their catalog, kinda made the generalization that it was computer generated. But in
1975 only had five cams total, none stated for turbos.
They start out mild with a .430 lift and a 272 degree duration, (110H)
All out racing has .480 lift and .310 degree duration. (500H)
These are all hydraulic cams made by Sig Erson. Why they decided
to make cams for turbo, I don't know except possible with a standard
cam in a turbchrged engine.
Isky does make Corvair cams yet?
Howard, I don't know if they're around anymore made cams for Star Corvair and maybe
Kings.
I've seen specs for normally aspirated but no turbos.
- flat6_musik
- Posts: 2659
- Joined: Sun Apr 04, 2010 10:03 am
- Location: Hesperia, CA
Re: Cam suggestions?
I didn't need to make any upgrades to run that cam, but I did go with the "fail-safe" gear setup from Clark's. It was at least a good $350 (approx.) for the cam, new gear and the fail-safe modification. Other than that, I'm just running a Pertronix ignition setup with their HV coil and a straight pipe from the turbo, no muffler. Next on my list is to rebuild my turbo.doctorwire wrote:Thanks for the suggestions. @flat6: what other, if any, upgrades did you have to make to run the 20 cam?
Re: Cam suggestions?
rough andy wrote:Isky does make Corvair cams yet?
No idea, I got mine a long time ago from Larry's Corvair when it was still in Gardena.
- cvair4life
- Posts: 802
- Joined: Wed Jul 14, 2010 12:22 am
- Location: San Antonio, TX
Re: Cam suggestions?
OTTO http://www.corvair.com/user-cgi/catalog ... n%20false;
Good forum discussion on isky viewtopic.php?f=40&t=289
Rafee Corvairs ISKY CAM SELECTION http://www.corvair1.com/search-results? ... eyword=cam
ISKY Spec sheet http://www.iskycams.com/pdfcatalog/2004-05/page74.pdf
Good forum discussion on isky viewtopic.php?f=40&t=289
Rafee Corvairs ISKY CAM SELECTION http://www.corvair1.com/search-results? ... eyword=cam
ISKY Spec sheet http://www.iskycams.com/pdfcatalog/2004-05/page74.pdf
1966 Corsa Coupe
- flat6_musik
- Posts: 2659
- Joined: Sun Apr 04, 2010 10:03 am
- Location: Hesperia, CA
Re: Cam suggestions?
See my above correction......I meant to say TB-20. Turbo cam.