We are currently running on the new domain and server: www.Speed-Talk.com

IMPORTANT: Update your bookmarks to https://www.speed-talk.com/forum/
(Right-click the URL and select "Bookmark this link")

Search found 1837 matches

by Orr89rocz
Thu Feb 20, 2020 12:43 pm
Forum: Engine Tech
Topic: Minimum Cross Sectional Area: Question
Replies: 155
Views: 5094

Re: Minimum Cross Sectional Area: Question

Yeah. I'm seeing that the heads are definitely on the small side for a 6000 RPM 383. That said, I could lower my peak HP RPM and still get satisfying results I would think. Maybe target peak around 5500 with a 5700 RPM shift. Interestingly, it has been compared to a tow truck. I can't say that I ha...
by Orr89rocz
Thu Feb 20, 2020 12:38 pm
Forum: Engine Tech
Topic: Minimum Cross Sectional Area: Question
Replies: 155
Views: 5094

Re: Minimum Cross Sectional Area: Question

You asked for 5500-6000 rpm range. Everyone said sure that will do that. 425-450 hp? Sure 255 cfm will do that Im lost where you think there is an approach outside the conventional way of thinking that exists? You are stuck at 1.8 csa and despite suggestions to work to get around that, you stated yo...
by Orr89rocz
Thu Feb 20, 2020 11:06 am
Forum: Engine Tech
Topic: Minimum Cross Sectional Area: Question
Replies: 155
Views: 5094

Re: Minimum Cross Sectional Area: Question

Lol this thread was over on page 1. What else are you looking for? Or are you looking for an answer you had in mind but waiting for someone to confirm your bias
by Orr89rocz
Thu Feb 20, 2020 8:18 am
Forum: Engine Tech
Topic: Minimum Cross Sectional Area: Question
Replies: 155
Views: 5094

Re: Minimum Cross Sectional Area: Question

gmrocket wrote:
Thu Feb 20, 2020 6:48 am
raynorshine wrote:
Thu Feb 20, 2020 12:17 am
-this is the most BIZARRE....thread i have ever seen/read/followed/ witnessed..... here on Speedtalk...

-talk about circular conversation....... :oops: absolutely no direction......... #-o
It's dynamic 😆
Lmao! Indeed
by Orr89rocz
Wed Feb 19, 2020 7:13 am
Forum: Engine Tech
Topic: weird BBC combo
Replies: 5
Views: 493

Re: weird BBC combo

Darts are suppose to come .005-.010” taller for proper machining finish
by Orr89rocz
Tue Feb 18, 2020 9:01 pm
Forum: Engine Tech
Topic: What kind of issues would I see with a turbo with to small of a an AR on the turbine?
Replies: 4
Views: 270

Re: What kind of issues would I see with a turbo with to small of a an AR on the turbine?

Thats doing well on just 15 psi for 260 inches. But i dont think you would have issues with those turbos assuming turbine is in the high 50’s mm low 60’s mm or bigger. I ran 60mm compressors with 65 mm turbines and .68 ar on my mild 400 sbc and only turned 5500 rpm making 800 hp crank 640 whp. 14 ps...
by Orr89rocz
Tue Feb 18, 2020 6:11 pm
Forum: Engine Tech
Topic: What kind of issues would I see with a turbo with to small of a an AR on the turbine?
Replies: 4
Views: 270

Re: What kind of issues would I see with a turbo with to small of a an AR on the turbine?

Hard to say without more info.

What size motor? Rpm range? What size turbine wheel? How much boost?

Any backpressure readings?
by Orr89rocz
Mon Feb 17, 2020 1:01 pm
Forum: Engine Tech
Topic: Minimum Cross Sectional Area: Question
Replies: 155
Views: 5094

Re: Minimum Cross Sectional Area: Question

I have only 255 so dialing back the RPM to 5500 gets 279 on the intake with heads needing 257.
So we are back to the 280/230 deg lobe thats been done over and over again 😊
by Orr89rocz
Fri Feb 14, 2020 7:45 pm
Forum: Engine Tech
Topic: Minimum Cross Sectional Area: Question
Replies: 155
Views: 5094

Re: Minimum Cross Sectional Area: Question

Torque Master is not a complete engine simulation program. There are a limited number of inputs. If just CR is increased (and peak HP RPM has remained constant) the duration shown is reduced but the est HP still has increased. For the program to want / show the same duration with the higher CR as i...
by Orr89rocz
Thu Feb 13, 2020 10:09 am
Forum: Engine Tech
Topic: L29 Vortec 454 on a budget
Replies: 38
Views: 3582

Re: L29 Vortec 454 on a budget

8.1 may have more tune ability with the pcm. The 96 7.4 would need Jet DST i believe which isnt bad but not as popular as hptuners.
by Orr89rocz
Tue Feb 11, 2020 4:37 pm
Forum: Engine Tech
Topic: Why does a tighter lsa need more compression?
Replies: 140
Views: 4838

Re: Why does a tighter lsa need more compression?

^^ agreed when fuel octane isnt limited but if it is then maybe there is correlation or some importantance
by Orr89rocz
Tue Feb 11, 2020 3:26 pm
Forum: Engine Tech
Topic: Why does a tighter lsa need more compression?
Replies: 140
Views: 4838

Re: Why does a tighter lsa need more compression?

Then why do we concern ourselves with SCR or DCR, or cranking compression?
Fuel choice i guess
by Orr89rocz
Tue Feb 11, 2020 1:59 pm
Forum: Engine Tech
Topic: Minimum Cross Sectional Area: Question
Replies: 155
Views: 5094

Re: Minimum Cross Sectional Area: Question

Thats begs the question and perhaps it was already discussed, does area matter as much as shape? 1.8 csa in a 15 deg ls style head vs 1.8 csa in a 23 deg sbc lets say. Straighter shot to the valve, less SSR angle, should tolerate higher airspeed. So more flow, more power but does it make more rpm? ...
by Orr89rocz
Tue Feb 11, 2020 1:05 pm
Forum: Engine Tech
Topic: Minimum Cross Sectional Area: Question
Replies: 155
Views: 5094

Re: Minimum Cross Sectional Area: Question

Thats begs the question and perhaps it was already discussed, does area matter as much as shape?

1.8 csa in a 15 deg ls style head vs 1.8 csa in a 23 deg sbc lets say. Straighter shot to the valve, less SSR angle, should tolerate higher airspeed. So more flow, more power but does it make more rpm?
by Orr89rocz
Tue Feb 11, 2020 11:18 am
Forum: Engine Tech
Topic: Minimum Cross Sectional Area: Question
Replies: 155
Views: 5094

Re: Minimum Cross Sectional Area: Question

IMO, the key isn't a cylinder head or a manifold, it's the camshaft. A Super Stock 358 with a 1.6in² pinch peaks at 7400. Right, but that valvetrain isnt gonna last on the street tho right? Or can something work to achieve both the rpm and the longevity of parts? I always thought what they do out o...