86 replies to this topic

[Bruiser]

Thanks, Warren
That’s a great thing to know before diving in
I see what you mean, I have a pair of incomplete Hs8 s from a jag and fitted one up for a look last night.
The flange would fall off if you opened it up to 2”, not nearly enough meat there for that.
I also noticed they are about 30mm longer than the hs6, too. That drops me right in it as far
as that idea goes, barely enough room as it is. Firewall is flat so no probs there at least.
Not an urgent issue, plenty of time to scratch my head over it in days to come
Plenty of things to sort out before worrying about that, anyway.
Mikunis are 10 mm shorter than hs6s..
Oh no, I’m gonna need a second job

[claysummers]

Thanks also for the info on the Seton manifold clearing early firewall warren. I knew there were some that did this.

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[Bruiser]

Picked up cam and lifters yesterday, it’s a crow one.
Lots of info on the cam sheet that comes with it

 14D36E47-EB45-415B-9D26-33D09E822415.jpeg   104.81K   9 downloads

Not the same lift as I was told the other day
No figure for valve lash on the sheet either. Was told go with .018”
Might have to check all is as it should be

[RallyRed]

Those lift numbers...are they saying that 3 were the same....right down to 0.01 thou.
Faaark thats pretty accurate and repeatable too.
Or is that "design", not as built?
No expert me.

Edited by RallyRed, 04 March 2023 - 04:59 PM.

[Bruiser]

Thinking out loud, here,
This is a cam pro computer cam doctor machine printout.
I assume the I4 , E4 at the top are the lobes they measured
The 3 sections are .050”, .020” and .200” checking heights.
The .050” is a given, the .020” is the solid cam equivalent of .006” (advertised duration)
The .200” is a bonus bit of news, I guess
They’ve repeated peak cam lift, peak valve lift and lift @ tdc for some reason
Makes it seem like a lot of bullshit to wade through!
Thanks Col, you’ve helped me understand it all a bit better myself

[RallyRed]

The guys on here that know about this stuff, and read dozens of cards, may chime in here.
I am interested in this stuff...but know f.a.

[yel327]

Thanks also for the info on the Seton manifold clearing early firewall warren. I knew there were some that did this.

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Is this one of the SU manifolds bent to clear early firewalls?

http://www.gumtree.c...&utm_source=sms

Edited by yel327, 04 March 2023 - 06:55 PM.

[claysummers]

Well it looks like could possibly work and near me so thanks.

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[Bruiser]

Do it Clay
Go on go on go on go on go on go on

[Bruiser]

Old cam is out, looks ok, I think

All lobes have these dark triangular patches

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Is this pretty normal?

The only doubtful mark on the whole thing is this one

 E8DE71FA-CFA9-44AB-9012-6CB0EF509EC7.jpeg   195.42K   6 downloads

What’s going on there?
I actually expected it to be pretty worn. There was an issue with no oil
pickup when it was first installed. I took it down to John Moyle who re-luberised it
Maybe the lifters copped some wear straight away
They have nice circular wear patterns, but are a tiny bit concave though.

[warrenm]

Is this one of the SU manifolds bent to clear early firewalls?

http://www.gumtree.c...&utm_source=sms

That is correct, the Seton manifold is similar to this.

[claysummers]

Taking the FB for a look later today.


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[claysummers]

Do it Clay
Go on go on go on go on go on go on

Thanks for the encouragement. I didn't need much. And to Byron for spotting. They haven't run for many years but look clean and tidy. New world for me. In need of one throttle lever, linkages and choke controls.

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[claysummers]

Nek minnit….

https://www.gumtree....tm_source=email


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[N/A-PWR]

Nek minnit….

https://www.gumtree....tm_source=email


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They are 7 inch

[Bruiser]

They have the 2 bolt carb flanges for the littler su’s like 1.25” hs2 or maybe 1.5”hs4

Well done Clay, are those going on the Ute?

[claysummers]

Eventually yes Bruce. I will be seeking info on here no doubt so will find appropriate thread rather than clutter up this one any more….


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[klevliend]

Hi Klevliend, it’s not too much of a build, just started out as a simple cam swap in my motor I built years ago.
Head went from a slight improve to a much needed freshen up and then turned out to be a ripper.
That manifold effect floored me too, he said it’s to do with the taper and csa change over the shortish runner.
Thought I understood a few things about this, but it just looks like a straight pipe to me (?)
The only other thing I’ve come across like this is an armours manifold on a 198cfm head dropped it to 192
The only dyno’d 1 3/4 su report I have been told about achieved 200ish rwhp. Not too shabby, really
Which bookface page is the head story on? Wouldn’t mind having a nosey at that

It was posted to the Holden Six Bana page on Feb 11. Got a lot of attention too

I've also read that the cain triple SU manifolds were cast to suit 2" and have the added benefit of being flat, so you don't need the angled fuel bowl mount for HD8s. Downside is they are really short manifolds, so would likely kill torque (never seen any figures though).

Also heres some photos of Seton manifolds I've seen. They're pretty rare can only think of one I've seen in the past 2 years for sale (not that I'm constantly looking)

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•  95263091_1861878050614439_6698511340794806272_n.jpg   270.95K   6 downloads

[Bruiser]

Thanks, klevliend will have to check it out soon.

Haha, no worries Clay, clutter your head off
Which needles did they come with?

Just when you think you know about all they did to your motor last time
I discovered these dinky little bore reliefs

 2F57A3EC-A852-4DC6-A895-A0C3277ED22A.jpeg   292.02K   7 downloads

Not sure how much effect they would have, being that small
but any is better than none

Also always thought the old cam was put in dot to dot and that these
adjustable gears ended up being a waste of time and $

 4950426F-FFE1-40E6-A9DE-EFE562B5E450.jpeg   220.49K   5 downloads

Turns out to have been 2 degrees advanced all along

Cam gears are being swapped over this afternoon, be ready to have a go at dialing it in soon
Just to check,
Does the new cam’s ICL of 107 and the ECL of 105 add up to 1 degree of retard ground into it?

[yel327]

Another set on a John Cain manifold

http://www.gumtree.c...&utm_source=sms

[Bigfella237]

The technology is almost to the point where you could design your own manifolds and 3D print them. You can even test flow the designs first in SolidWorks!

[Bruiser]

To answer my own question, those lobe centrelines do mean 1 degree of retard.
Just spent the last 2 days playing around with a degree wheel.
Good fun, when you get the hang of it. Makes it easier to understand how some of the
cam maths works and where the numbers actually come from
Crow’s cam sheet didn’t help either, the valve event before and after tdc info
is arse about somehow
Also found out it’d be best with a 104 degrees intake centreline.
Checked it all ways possible, as it sits it’s 101, so the crank gear needs to come off
and it’s being a prick. Tried some ice on the crank snout, then quickly whacked heatgun on the gear,
still no joy.

Does any one have the golden tip to crack ‘em off?

[yel327]

Steering wheel puller with something to protect the crank snout. Something like this. You might need longer bolts though to clear the sump.

 

https://www.ebay.com...kp:BFBM0sbFhthh

[Bruiser]

Phone calls to Tony and to crow cleared a fair bit up for me
The .600” lift first ordered was something to do with an even bigger Chrysler lifter
and ended up changing to around .555” with the lash.
Bloody crow sheet mentions 0 lash in each section, so had me wondering wether they
had ground me up a hydraulic by mistake..
Traps for young players

[claysummers]

I had mine off recently Bruce, after stripping the thread on my old chinesium puller and buying a new one from CPP. I was using the pneumatic rattle gun at the time on it.


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