Yes If the answer is VE%, so the next question would be why/how ???
It’s Winter. Let’s discuss strokers. How much faster
- Thread starter pittsburghracer
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Yes If the answer is VE%, so the next question would be why/how ???
MOPAROFFICIAL
Oogliboogli
Thrust hp loss? Between the 3.31 ,4" as if it
Not measurable nor a comparison to deduce between the 2 if the power can be any amount. But 2hp or a belt worth, but what rpm? Factors galore all the way into the machining.
They make reverse offset pistons fwiw. They do free up/shed friction, or make power. Whatever end you sit at.
This, again, is more a piston reversal type of power diff/ be it gain or loss.
Not measurable nor a comparison to deduce between the 2 if the power can be any amount. But 2hp or a belt worth, but what rpm? Factors galore all the way into the machining.
They make reverse offset pistons fwiw. They do free up/shed friction, or make power. Whatever end you sit at.
This, again, is more a piston reversal type of power diff/ be it gain or loss.
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Rat Bastid
Dunamis Metron
B3422w5
Well-Known Member
lighter slug= good, right?
33IMP
Well-Known Member
Agreed! But, for example, if you are starting with a 318, and stroke it to 390, I think I would upgrade from a 318 head. Eddie's would be a huge improvement, and for a street strip car.... trick flows.
MOPAROFFICIAL
Oogliboogli
It still is last I checked... and definitely is on a site based around 1960's and 70's A body mopars...and **** why the 3.79 cranks? But really on the same progressive wave you rode in on... maybe this topic is already irrelevant...nothing being said is of any significance.
B3422w5
Well-Known Member
agreed. But an eddie is still a 340/360 head, and would become marginal in a fulll boogie stroker anything, even a 390 type deal, although the difference gets worse the more cubes.
A trickflow is a tiny head for a stroker too. My buddy’s Duster starts wheezing about 1100foot with a 28 tire abd 4.30 gear running mid 10’s. Its just a better bandaid.
That is a great question no one ever has been able to answer except as described after your post….
We know there is more side loading because there not 250,000 mile engines.
If you could get a pressure sensor on the other side of the cylinder wall…????
OMG! Come on dude!
I can’t put enough LMAOROTF emojis here!
MOPAROFFICIAL
Oogliboogli
Street strip? Trickflows? A 318?
Assuming the bottom end is built near 11.1 compression and cam'd .550+ . That's 190cc 4.040" or so chamber on that LITTLE [email protected] bore.
Better relief the bores a bit.
As for 390 cid or heads...
If the 318 heads are capable of what folks claim when ported.. then they'll make for more useable tq than the 318 with just eddy heads. Best head, nope. But if I had the choice..and had to pick.. I'll pick the extra cid and work the small heads over myself. Lift the valve .500-.550 and turn up the duration into the 300's
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Rat Bastid
Dunamis Metron
You can calculate friction losses on the dyno. Also BMEP is a big deal. Most ignore it.
Rat Bastid
Dunamis Metron
It still is last I checked... and definitely is on a site based around 1960's and 70's A body mopars...and **** why the 3.79 cranks? But really on the same progressive wave you rode in on... maybe this topic is already irrelevant...nothing being said is of any significance.
Everything of significance was already said. You either didn’t read it, ignored it or didn’t understand it.
I want a huge bore and short stroke if we are putting 18 psi of boost to it
My preference for engines boosted or not.
400 B engine comes to mind.....
MOPAROFFICIAL
Oogliboogli
By page one.
The rest was a mental circle jerk for the displacment challenged.
I thought it was based on some parameter, OP's parts combo..or
MOPAROFFICIAL
Oogliboogli
471 out of a 400 is my lamp...
MOPAROFFICIAL
Oogliboogli
I watch farm truck and azian...and I hear psi is where it's at.
1. ....60's alllll day!
1. ....60's alllll day!
33IMP
Well-Known Member
In a post elsewhere here was a comparison of a 454 Chevy, 455 Pontiac (longer stroke), 455 Olds, (longer stroke) and a stroker 451, 400 based.
The Mopar finished last, by a substantial margin. Why? Stock iron heads that flowed poorly compared to the others, probably 100 cfm less than the winning Chevy.
Building a stoker, without improving the heads is just silly, imho.
MOPAROFFICIAL
Oogliboogli
Last 906 head I flowed, as cast went about 227-230cfm.
Best as cast 2.02 J head I ever flowed went 228-230cfm.
Made me think.
Rat Bastid
Dunamis Metron
Yup. The BBM is the most under headed platform out there. It’s hideous. Even the predator head has limits, mostly due to bore spacing.
33IMP
Well-Known Member
Engine masters has made fun of stock bbm Mopar heads, calling them a poor 350 Chevy head on a big block. Just about right, too.
33IMP
Well-Known Member
On a garbage motor home 440, engine masters got a 70hp bump from TF heads on a 7.4 to 1 shortblock. How much more is a head swap worth on a 10 to 1 500?
How come it seems a bbm can make 450 hp with stock heads and 340 makes around 400 hp with similar flow from what I’ve seen?
is it port size ??
33IMP
Well-Known Member
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