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Discussion Starter · #641 ·
JA,
Please still post up the info on your PD cam for me to compare.
I just want to see it, and I won’t be discussing it!

Thanks,
Bruce
I'll post up the PD cam info when I get home. Thanks for being willing to chat about this stuff. I appreciate it.
 
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Discussion Starter · #643 ·
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Not my first time but OK
Matt,
As you know engine builders have debated camshafts for many years.
I didn't say you were wrong, I simply stated it is not the way I would do it.

As an example; Isky has used a symmetrical cam for turbo applications for years.

-the legendary camshaft designer UD Harold-
UD Harold who worked with Crane, helped to establish Comp Cams,
General Kinetics, Bullet and many other cam companies stated. . .
With Turbo's - Shorter exhaust cams restore throttle response.

UD Harold also has stated:

The part that is short is the exhaust overlap.

-regarding shortening the overlap period-
The boost pressure has to be above exhaust back-pressure, or the flow
goes the wrong way, and sometimes causes manifold explosions.

UD Harold also went on to state:

BTW, most turbo cams are on wide LSAs, and advanced in the engine,
so that the exhaust cam opens about where a much bigger normal exhaust
cam would anyway......

-----------------------------------------------------------

Mike Jones of Jones Cams, who designed multiple winning camshafts for
Indy back when they ran Turbo's, as well as many NHRA Pro Stocks has stated. . . .
Unlike Blower motors that require more exhaust then intake duration,
for almost all the turbo race engines we've designed cams for, we almost
always go with a single pattern cam.
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-In general I believe. . .
Opening the exhaust valve too early, exposes the exhaust system to
a higher initial gas pressure in the cylinder.

However, big exhaust lobes, like big exhaust headers, rapidly lower the
pressure and gas velocity i
n the exhaust port/header, and cool the exhaust
gases down.
***This is also how many NA Engine builders build their headers.

They use a slightly small primary header pipe, so that heat is still
in the pipe at overlap.
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Finally, I am not here to state I know it all.
I am not here to state that you know nothing.

And in the past the both of us have been known to bring good info to this forum.

That's it for me regarding this. . . .

Take care Matt!
Bruce
 

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Thats all fine Duck. We were due for our biannual disagreement anyway lol.

FWIW this cam has been used before on 4” stroke twin setups in heavy cars with good results. Just finished another LS3 port 427 twin turbo engine where I used a bit different grind since the turbos were larger, the car weighed a lot less and was more drag strip focused running a glide etc.


Then a single 76mm 5.3 build with cathedral heads that was yet again quite different.

Another interesting one was a 6.0 with LSA heads and good studs with twins and it actually still has one of my nitrous cams in it from a previous setup. Not ideal but actually not too far off either and ended up running [email protected]
 

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Thats all fine Duck. We were due for our biannual disagreement anyway lol.

FWIW this cam has been used before on 4” stroke twin setups in heavy cars with good results. Just finished another LS3 port 427 twin turbo engine where I used a bit different grind since the turbos were larger, the car weighed a lot less and was more drag strip focused running a glide etc.


Then a single 76mm 5.3 build with cathedral heads that was yet again quite different.

Another interesting one was a 6.0 with LSA heads and good studs with twins and it actually still has one of my nitrous cams in it from a previous setup. Not ideal but actually not too far off either and ended up running [email protected]
You wrote:
"That's all fine Duck. We were due for our biannual disagreement anyway lol"
Yep, it just seems to happen..lol

As I stated; I would have gone about this differently, but I am done
with this, and most likely won't have anything more to say about it. . . .

Cheers
 

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I look forward to the results…..
And I am sure the results will be 'Spectacular'. .;)

--------------------------------------------------------------

Just for 'Shits & Giggles'. . .
I spoke to a friend of mine the other day who builds V-10 Vipers.
With twin turbos, he is now looking for 3,000 fwHP.

So I think one must look at the various families of
cars available, and gauge how well one is doing,
against the leader of the pack so to speak, within
each of those families.

Cheers
 

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I like 3000 hp vipers
3000 HP means it must drive like a dog in traffic - and what about the carbon footprint?

I'm not sure we should be celebrating such excess as mature adults, who are obsessively concerned with the status of our lawns?

Moreover, I can't imagine how the tread life on those soft-walled drag radials could be even remotely cost-effective????
 

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Discussion Starter · #651 ·
Well I can’t fine the valve events for the TMS PD blower cam. My card has bleached and I can’t read it. I know I took a photo of it, but I can’t seem to find it in my 72,692 photos on my phone.

Not done looking.
 
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3000 HP means it must drive like a dog in traffic - and what about the carbon footprint?

I'm not sure we should be celebrating such excess as mature adults, who are obsessively concerned with the status of our lawns?

Moreover, I can't imagine how the tread life on those soft-walled drag radials could be even remotely cost-effective????
Jesse,
I didn’t know we had any mature adults on this forum. . .
when did that happen?… LOL
 

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Well I can’t fine the valve events for the TMS PD blower cam. My card has bleached and I can’t read it. I know I took a photo of it, but I can’t seem to find it in my 72,692 photos on my phone.

Not done looking.
JA,
How much horsepower are you attempting to produce?
Do you have the flow numbers for the cylinder heads you’re purchasing?
 

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Discussion Starter · #654 ·
JA,
How much horsepower are you attempting to produce?
Do you have the flow numbers for the cylinder heads you’re purchasing?
Ha! Less than what I’ll wind up making!

I will get the SD tune buttoned up after the head and cam swap and get her fat ass to the track and dyno.

Truthfully I wanted a quality cast head to take advantage on the 6-bolt head bolts I have. I wanted a thick deck and inconel valves. They also had to use LS3 rocker systems as I don’t want to buy new roller rockers.
 

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Discussion Starter · #658 ·
I just deleted my mufflers…..







J/K
 

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I need glass packs to ruin the sound. OEM mufflers for sale shortly!

Sent from my SM-G991U1 using Tapatalk
 
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