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Isky Cam options for 65’ 140
Posted by: LeadFootLogan ()
Date: January 14, 2018 05:44PM

I am building my Corsa 140 for Autocross and I want to know what isky 280 cam would be best for hp and torque. Any suggestions and if possible what kit or part number to look up?

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Re: Isky Cam options for 65’ 140
Posted by: 66vairman ()
Date: January 14, 2018 08:28PM

You will a lot of suggestions.

It really comes down to what YOU want.

Mild came with low RPM pull and peaks by 5,000 RPM or more aggressive cam with lower RPM pull, but more power at higher RPM.

I run the Isky 260 cam in my 140's and have no complaints. Overall good driving cam and pulls nice from low RPM. I run the lower tension stock valves springs that are easier on the cam.

Others like the looping idle and high RPM pull from the Isky 280 requiring high tension (and able to collapse farther than stock) valve springs. This more aggressive cam will be suitable for high RPM power for racing. Not so happy driving in stop and go traffic.

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Re: Isky Cam options for 65’ 140
Posted by: vairmech ()
Date: January 15, 2018 05:14AM

With your screen name I am surmising you will like the 280 with either a 2 or a 4 degree advance key in the cam. I drive that cam in my built 69 140 engine and I have no issues driving on the street, my wife also drives the car with no issues!

Before you make a cam choice you need to figure or know what RPM you will be running in your autocross's and build for that.

Keep in mind there is more cam choices than Isky!

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com



Edited 1 time(s). Last edit at 01/15/2018 05:15AM by vairmech.

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Re: Isky Cam options for 65’ 140
Posted by: Wagon Master ()
Date: January 15, 2018 08:52AM

vairmech Wrote:
-------------------------------------------------------
> With your screen name I am surmising you will like
> the 280 with either a 2 or a 4 degree advance key
> in the cam. I drive that cam in my built 69 140
> engine and I have no issues driving on the street,
> my wife also drives the car with no issues!

vairmech Wrote:
-------------------------------------------------------
> The 140 PG crank is good to use only with the low
> HP cams like the -889, Isky 260, OT-10, my FC cam
> and anything similar.

So I can better understand the effects of advanced/retarded cam timing....You advance the cam timing in your built 140 street car to improve the low end with a slight sacrifice of top end performance. You then retard the cam timing in a motor cammed for low end torque to slightly increase it's top end? Similar to what the factory did to improve drive-ability in a 140 PG?


'64 Monza Coupe 140 4 speed
'61 700 Lakewood 95 4 speed
'69 Monza Convert. 140 Auto.

Been aircooled since 1973
Northwest Ohio

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Re: Isky Cam options for 65’ 140
Posted by: JimBrandberg ()
Date: January 16, 2018 05:14AM

<<>>

For LeadFootLogan, what would be the target Intake Centerline? I think 108 is Isky standard.

For me, I have a 140 PG to build. Would Isky 260 be a good choice? Installed at what Intake Centerline? Thanks,

Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: Isky Cam options for 65’ 140
Posted by: Spectre ()
Date: January 16, 2018 05:24AM

I had an ISKY 270 in a 140/4spd. That car ran great.

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Oklahoma City, OK

Click for Oklahoma City, Oklahoma Forecast

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Re: Isky Cam options for 65’ 140
Posted by: vairmech ()
Date: January 17, 2018 09:14AM

Wagon Master Wrote:
-------------------------------------------------------
> vairmech Wrote:
> --------------------------------------------------
> -----
> > With your screen name I am surmising you will
> like
> > the 280 with either a 2 or a 4 degree advance
> key
> > in the cam. I drive that cam in my built 69 140
> > engine and I have no issues driving on the
> street,
> > my wife also drives the car with no issues!
>
> vairmech Wrote:
> --------------------------------------------------
> -----
> > The 140 PG crank is good to use only with the
> low
> > HP cams like the -889, Isky 260, OT-10, my FC
> cam
> > and anything similar.
>
> So I can better understand the effects of
> advanced/retarded cam timing....You advance the
> cam timing in your built 140 street car to improve
> the low end with a slight sacrifice of top end
> performance. You then retard the cam timing in a
> motor cammed for low end torque to slightly
> increase it's top end? Similar to what the factory
> did to improve drive-ability in a 140 PG?
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

That's pretty much how it works.

Take the 140PG engine from GM, they used an 889 cam, 95hp cam. That cam if run with a straight key will run out of power about 4500-5000 rpm, noticeably. GM couldn't have that in a car that would seem to run out of power for warranty reasons, can you envision the nightmare? How do you cure that? retard the cam timing so the engine will rev to redline.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Isky Cam options for 65’ 140
Posted by: matchlessmo ()
Date: January 17, 2018 08:20PM

Fellas, how about a 270 cam in a 110 motor with powerglide, would you recommend 2 or 4 degree advance or leave stock. thanks


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