CID/RPM/CFM/HP

[skinny z]

[quote=randy331 post_id=695184 time=1509163526 user_id=2346]
[quote="skinny z" post_id=695048 time=1509118174 user_id=6881]
I've ignored it

[/quote]


That would be my suggestion for most of the advise posted on this thread.

Randy
[/quote]

The same applies to most forums.
Back in the day, our principle task was to source out information. Today, it's filtering it.

[randy331]

Someone can make a real dyno tested 500 HP on a 385 CID SBC with a 255cfm head but you will need to seriously STEP on that 385
to get there.. It will want to rev up....

That was my suspicion.

It's also wrong.

Take a look at this thread about a 383. Pretty simple engine. It has a cam close to the one you have now.
https://www.speed-talk.com/forum/viewtopic.php?f=1&t=42988

I'd use the cam you have and save that money for other things. Little more rocker ratio maybe, springs ?

There's not enough info on your heads to say what they'd make.

Randy

[Newold1]

My opinion and experience tells me that a 385 inch SBC properly spec'd and built will easily attain 500HP and be quite steetable with the correct camshaft, cylinder heads and induction. The fact I know is that your 170cc-253cfm heads flowing at .500 lift ain't gonna get you there and at the 6200-6500 rpms you will need they are done at 5500 on a 385. Your heads and camshaft hit the wall at about .500 lift and its gonna take a high .500" area to mid .600" lift well matched cam and a 210cc 270 -285 cfm head at .600" to .650" to get you there in my humble opinion. This can still be a very streetable package.

[skinny z]

[quote=randy331 post_id=695329 time=1509228014 user_id=2346]
Take a look at this thread about a 383. Pretty simple engine. It has a cam close to the one you have now.
https://www.speed-talk.com/forum/viewtopic.php?f=1&t=42988[/quote]

Are these the heads used on the 383? Did a quick net search and came up with these numbers but haven't verified.

For the record the heads in question are RHS Pro Torker Vortec (2.02/1.60). Reworked by AMS RAcing with 5 angle VJ, bowl work and some time spent on the short turn. Flow bench (4.030" bore) with numbers not unlike those listed above.

[skinny z]

There's this 383 from an acquaintance of mine. (Manages the machine shop where my heads were done). I had completely forgotten about this build as he'd moved on to some twin turbo stuff.
Nothing really special. Ported Vortec heads. Never liked his cam spec much but it did make decent power.

https://www.youtube.com/watch?v=ni0xCy9bmTM

Swapped intakes and added a spacer. A little more intake rocker. Nearly 500 HP. Ans surprisingly (to me) not a lot of RPM to do it.
Seems entirely possible now.
[attachment=0]383.jpg[/attachment]

[F-BIRD'88]

No read the fine print Correction factor 1.108

"481 HP" real engine dyno power was 434 HP

The engine made 434 hp.. It will make LESS in your car. (Truck?)

Randy's engine has a very high compression ratio.
It will not run on pump gas. Nice build but not a good illustration. Not a "street motor"

Yes you Could make a nice powerfull 383 with the Torker Vortec heads
but you will need to "Step" on it pretty seriously for 500hp or 480 HP

[F-BIRD'88]

That engine in your 3650 LB street "cruiser" will run about a 110-112 MPH 1/4 mile
Mid to low 12's.


I wonder what the dyno correction factor is on Randy's dyno test
His car performance indicates 537 HP. (127 MPH)
Your car's efficiency will not even be close to his race car.

You can get your local weather conditions including historical data
from The NWS or Environment Canada websites.

Is that 2080 ft elevation the elevation where you and your machine shop friend are at?

Was that engine dynoed at the shop in Shreveport LA? 144 FT elevation?

How can the dyno test be dated 2013 and the video published in 2012?

[randy331]

Randy's engine has a very high compression ratio.

Pseudo has 11.4-1 comp. "That's very high compression ratio" ???

Yes you Could make a nice powerfull 383 with the Torker Vortec heads
but you will need to "Step" on it pretty seriously for 500hp or 480 HP

Could you please give us an in depth explanation of " you will need to "Step" on it pretty seriously for 500hp or 480 HP "

Randy

[vortecpro]

There's this 383 from an acquaintance of mine. (Manages the machine shop where my heads were done). I had completely forgotten about this build as he'd moved on to some twin turbo stuff.
Nothing really special. Ported Vortec heads. Never liked his cam spec much but it did make decent power.

https://www.youtube.com/watch?v=ni0xCy9bmTM

Swapped intakes and added a spacer. A little more intake rocker. Nearly 500 HP. Ans surprisingly (to me) not a lot of RPM to do it.
Seems entirely possible now.
383.jpg

What town was this engine tested in?

[F-BIRD'88]

Randy's engine has a very high compression ratio.

Pseudo has 11.4-1 comp. "That's very high compression ratio" ???

Yes you Could make a nice powerfull 383 with the Torker Vortec heads
but you will need to "Step" on it pretty seriously for 500hp or 480 HP

Could you please give us an in depth explanation of " you will need to "Step" on it pretty seriously for 500hp or 480 HP "

Randy

It's your motor you explain it. Yes 11.4:1 is a very high cr for a "Street cruiser"

You use 100 octane LL because that is what a 11.4:1cr motor needs so it don;t hammer it self to death.
It will on pump gas...

[skinny z]

[quote=vortecpro post_id=695446 time=1509289637 user_id=8998]

What town was this engine tested in?
[/quote]

Edmonton, Alberta.
Elevation 2200'
(Would have to look up the DA of the day if that's of much significance).

[vortecpro]

What town was this engine tested in?

Edmonton, Alberta.
Elevation 2200'
(Would have to look up the DA of the day if that's of much significance).

That baro on your test is right in line with 2200 feet elevation, I get 430 observed uncorrected HP.

[vortecpro]

That engine in your 3650 LB street "cruiser" will run about a 110-112 MPH 1/4 mile
Mid to low 12's.


I wonder what the dyno correction factor is on Randy's dyno test
His car performance indicates 537 HP. (127 MPH)
Your car's efficiency will not even be close to his race car.

You can get your local weather conditions including historical data
from The NWS or Environment Canada websites.

Is that 2080 ft elevation the elevation where you and your machine shop friend are at?

Was that engine dynoed at the shop in Shreveport LA? 144 FT elevation?



How can the dyno test be dated 2013 and the video published in 2012?

How do you arrive at 537 HP?

[randy331]

I guess you miss the whole point of posting a link to Pseudo.

Most would be able to look at it and think, well it's more comp than I'd want on pump gas, but it's completely un touched heads that are 180cc (similar size to the OP vortecs after his porting) they are also Vortec heads ( OP has vortecs ) so I could probably go down to 10.5 comp and the ported heads will more than make up for the comp difference. And the cams are close and both HYD rollers. Some may see useful info there.

So I guess skinny z has to decide who he believes. Ones saying it can't be done and give up, or ones saying it can be done cause they've done it and go about learning how.

Just for the record, Pseudo could run on 92 fuel, but 100LL is not much more cost and much better fuel. I have AV 100LL in my mower, my roto-tiller, my 50-1 mix for my chain saw/concrete saw/leaf blower/and weed eater etc. Much better fuel for things sitting for awhile.

Randy

[F-BIRD'88]

On the day and time on the dyno sheet in Edmonton Alberta the sea level pressure was 30.23

Actual station pressure was 28.04 not 27.50...

i will go out on a limb and say that he forgot to reset the weather station from the night/day before.
as the Barometer was rising all day from a low of 27.70

This matters.


Randy spin it how ever you want. You are shooting yourself in the foot there.

And the GM Bowtie Vortecs are way ahead of the RHS pro torker Vortecs even after the porting.
I am very familiar with Vortec heads.

Coulda woulda shoulda.....

How do you arrive at 537 HP? easy 127 MPH in a 2950 race car

You must have picked up about 10 HP with the valve spring change.
The change in car MPH indicates that. Nice Job. Don't shoot yourself in the foot.