Cam Selection ( found the death rattle)

Tazz Old Skool

1,315 posts · joined Aug 2002 · 20 Nov 2006, 3:13 pm

#556993

Ok found the death rattle.
It seems the stock rivets let go and have rounded out the holes on the camshaft.

Time for upgrade!

I have been looking at eagle cams...
Adv. Duration 286° / Dur. @ .050" 248° / Lift @ cam .430" / Lift w/1.1:1 Rocker Arms .473

I would like some feed back on cam selection.

1916cc counterwieght crank, ported heads, 12lb flywheel,
balanced rods, std rockers and springs, twin 45 Del's, 009 with compufire ignition.

Also thinking Straight cut gears for the reduced excessive side load on the cam bearing thrust shoulder when using heavier valvesprings.

This is all goin into kermit so the extra resistance of all the fans straight off the front will reduce some performance.😬

Thanks

Tazz

1962 Type3 Squareback
1967 Type3 Fastback "Kermit"

The truth is important. It will set you free

56astro Custom Title Time!

1,772 posts · joined Aug 2002 · 20 Nov 2006, 3:16 pm

#556995

Any details of the heads?

VW car, VW engine ...... keepin it "real"
35MPG on 101.3kPa

Tazz Old Skool

1,315 posts · joined Aug 2002 · 20 Nov 2006, 3:18 pm

#556997

Large ports( almost D ports) and heavy valve springs... STD 1:1 rockers with ball feet.
Thats about all i know..

Tazz

1962 Type3 Squareback
1967 Type3 Fastback "Kermit"

The truth is important. It will set you free

xornge666x Wolfsburg Wizard

460 posts · joined Sep 2006 · 20 Nov 2006, 3:21 pm

#557000

wow, dont see that so often on a type 1 cam/gear! Seen plenty of type 4's do it.
Is that a stock cam that has been reground?
Is it a daily driver??
What comp are you running?

koolkarmakombi enkarmarising

2,078 posts · joined Jun 2003 · 20 Nov 2006, 3:50 pm

#557003

Clutching at straws from afar, heavy springs could have helped it???

Have you considered ratio rockers at the same time ie match cam and valve gear? The ramps can be a bit aggressive on some cams and this can lead to a shorter life.

Glad it was that death rattle and not something destructive nasty!

Tazz wrote:Large ports( almost D ports) and heavy valve springs... STD 1:1 rockers with ball feet.
Thats about all i know..

Tazz

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dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 · 20 Nov 2006, 5:27 pm

#557031

That sounds like a pretty good choice depending on your driving style.
Other similar cams are Engle W110 and Scat C35.
These two have less lift on the lobe.

Your cam has alot of lobe lift. Perhaps a little less may be better, but I am unfamiliar with that particular grind.
Most New Hi Perf cams come with an aluminium bolt on gear and that should be ample with what you have.
But straight cuts do sound cool, but may become annoying on a long trip.
If you do buy straight cuts, get the best you can afford. I have seen the cheap ones shatter (cast)

westi wrote:That's mad Alan.

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 · 20 Nov 2006, 5:28 pm

#557032

http://www.geneberg.com/cat.php?cPath=165_2773

Tazz Old Skool

1,315 posts · joined Aug 2002 · 20 Nov 2006, 7:24 pm

#557064

W-110 camshaft- .430 lift x 284 duration....
Eaglecamshaft- .430 lift x 286 duration....
Scat c35 .410 lift x 286 duration....
Very little difference between the three....

The only thing i was worried about the straight cuts was heat.... This is goin into type3 fastie....
Heat is a big problem.

Tazz

1962 Type3 Squareback
1967 Type3 Fastback "Kermit"

The truth is important. It will set you free

Tazz Old Skool

1,315 posts · joined Aug 2002 · 20 Nov 2006, 7:28 pm

#557066

koolkarmakombi wrote:Clutching at straws from afar, heavy springs could have helped it???

Have you considered ratio rockers at the same time ie match cam and valve gear? The ramps can be a bit aggressive on some cams and this can lead to a shorter life.

Glad it was that death rattle and not something destructive nasty!

Tazz wrote:Large ports( almost D ports) and heavy valve springs... STD 1:1 rockers with ball feet.
Thats about all i know..

Tazz

From what i can gather its just a reground std cam... and with the force of snapping second and third the rivets just didnt hold... never designed to hold that much preasure.
The heavy springs could have helped it along....
I'm just lucky they didnt let go..... bent valves and holy pistons....

Tazz

1962 Type3 Squareback
1967 Type3 Fastback "Kermit"

The truth is important. It will set you free

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 · 20 Nov 2006, 11:01 pm

#557246

Tazz wrote:W-110 camshaft- .430 lift x 284 duration....
Eaglecamshaft- .430 lift x 286 duration....
Scat c35 .410 lift x 286 duration....
Very little difference between the three....

The only thing i was worried about the straight cuts was heat.... This is goin into type3 fastie....
Heat is a big problem.

Tazz

The other cams that I suggested have similar timing figures but less lift at the valve.
The W110 has .431" at the valve with 1.1 rocker.
The eagle cam has a lot more.
The C35 I am not sure about its valve lift with 1.1 rockers, but it looks as though your info is valve lift for the Engle and Scat, and cam lift for the Eagle.

Engine heat should have no effect ON, or FROM the cam or gear.
If your type 3 is running hot, you have tuning(fuel mixtures and ignition timing) or cooling system issues,
and possible compression ratio excesses.

westi wrote:That's mad Alan.