AFR 325 flow sheets.... anyone ever flow these heads?
#131
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To gain 700RPM with same props, my guess, is you're gonna need to be making about 175hp more, than you were. So, about an 800HP 540. That would take you from 72mph, to about 82mph, with same props spinning 6000, instead of 5300. I just don't see 82 in a TRS mistress even with 700's.
Realistically, with a cam change, intake change, my guess, 5500 74-75mph, instead of 5300, and 72-73mph.
Normally, wouldn't be worth it. But since you're cams went to chit, and heads went to chit, its a no brainer at this point to make some changes.
Realistically, with a cam change, intake change, my guess, 5500 74-75mph, instead of 5300, and 72-73mph.
Normally, wouldn't be worth it. But since you're cams went to chit, and heads went to chit, its a no brainer at this point to make some changes.
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#133
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Yes and fully dressed with flame arrestor.
#134
#135
My old engines...565CI,, PBM rotating assembly, 9.5:1 Pro Comp 320 heads, Cam was 236/[email protected], .578/.578 114LSA, Chinese intake, 870cfm Vacuum sec carbs...
Boat ran 73.7 with lots of seat of the past pull from 4000-5500 IN BOAT...25 Mirage plus's@5500... beste speed I saw was even in spit flat water...
[ATTACH=CONFIG]563526[/ATTACH]
New engine 540CI, AFR325's, 9.5:1, cam was 241/[email protected] .681/.663 112LSA boat saw 73.2 ONCE... spinning 25 mirage plus's to 5300... were spec'd to spin existing props to 6000...
[ATTACH=CONFIG]563527[/ATTACH][ATTACH=CONFIG]563528[/ATTACH][ATTACH=CONFIG]563529[/ATTACH]
So new engines made more HP, but tad less TQ, boat was a SLUG and would not even meet old speed let alone faster...
So this years goal was to get things dialed in and move powerband UP... TQ and HP....
Boat ran 73.7 with lots of seat of the past pull from 4000-5500 IN BOAT...25 Mirage plus's@5500... beste speed I saw was even in spit flat water...
[ATTACH=CONFIG]563526[/ATTACH]
New engine 540CI, AFR325's, 9.5:1, cam was 241/[email protected] .681/.663 112LSA boat saw 73.2 ONCE... spinning 25 mirage plus's to 5300... were spec'd to spin existing props to 6000...
[ATTACH=CONFIG]563527[/ATTACH][ATTACH=CONFIG]563528[/ATTACH][ATTACH=CONFIG]563529[/ATTACH]
So new engines made more HP, but tad less TQ, boat was a SLUG and would not even meet old speed let alone faster...
So this years goal was to get things dialed in and move powerband UP... TQ and HP....
For christ sake look at your torque that 565 made from 3000 to 5200 compared your 540. It aint no wonder
the 565 pulled hard in your boat. You are going to have to out produce the torque your 565 made, not just move
your 540's TORQUE an hp up in rpm...
"So new engines made more HP, but had less TQ, boat was a SLUG and would not even meet old speed let alone faster.."
saying that right there alone says you need ALOT more torque. I would think TQ alone is quite a bit more important than hp...your dynoes prove it.
Your 540 made more torque only "a couple a hundred more rpm" (540 more cam) more than your 565. So just moving your 540's powerband up in rpm alone isn't going to increase speed, unless your making considerably more TQ than your old 565......
But who knows, hopefully the new mills are making some crazy TORQUE and carry your boat well......
Last edited by chancer540; 01-08-2017 at 10:54 PM.
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My boat went from 88mph to 96mph, by adding power from 5000-6000rpm. I actally lost a bit of torque in the 4000rpm range. I am pulling the same props to 6000-6200 now, instead of 5500-5700 .
It doesnt "carry" any different. It just goes faster
It doesnt "carry" any different. It just goes faster
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it seems that the word TORQUE confuses people sometimes.big torque at 3500 that falls off at 4900 will not push the boat the same as an engine that makes peak torque at 4400 and carries it through 5800 rpm.the wrong cam can KILL the torque curve.
#138
Tim has repeatedly said his old 565's were 2-3 mph faster. And when you look at the differences in the dynos it makes since.
If he would of put his 540 cam and afr heads on his old 565's i think he would of bettered his best mph. His 540's aren't making near the power his 565's were.
How do go you from old motor making X amount of hp and new motor making 34 more hp and go slower?
Could it possibly from old motor averaging (626) tq 506 hp and new motor only being (603) tq and 501 hp.
I'm sorry, but from the first time when i seen Tim went from the bigger cubes to the smaller one's i just couldn't figure out why.
Especially in a N/A engine. Boosted engine totally different animal. Especially when adding more boost and making the kind of changes like you have made.
Very impressive......
If he would of put his 540 cam and afr heads on his old 565's i think he would of bettered his best mph. His 540's aren't making near the power his 565's were.
How do go you from old motor making X amount of hp and new motor making 34 more hp and go slower?
Could it possibly from old motor averaging (626) tq 506 hp and new motor only being (603) tq and 501 hp.
I'm sorry, but from the first time when i seen Tim went from the bigger cubes to the smaller one's i just couldn't figure out why.
Especially in a N/A engine. Boosted engine totally different animal. Especially when adding more boost and making the kind of changes like you have made.
Very impressive......
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I dont understand why you would move down in cubic in. and expect the boat to be faster, when its cleary making a lot less TQ.
For christ sake look at your torque that 565 made from 3000 to 5200 compared your 540. It aint no wonder
the 565 pulled hard in your boat. You are going to have to out produce the torque your 565 made, not just move
your 540's TORQUE an hp up in rpm...
"So new engines made more HP, but had less TQ, boat was a SLUG and would not even meet old speed let alone faster.."
saying that right there alone says you need ALOT more torque. I would think TQ alone is quite a bit more important than hp...your dynoes prove it.
Your 540 made more torque only "a couple a hundred more rpm" (540 more cam) more than your 565. So just moving your 540's powerband up in rpm alone isn't going to increase speed, unless your making considerably more TQ than your old 565......
But who knows, hopefully the new mills are making some crazy TORQUE and carry your boat well......
For christ sake look at your torque that 565 made from 3000 to 5200 compared your 540. It aint no wonder
the 565 pulled hard in your boat. You are going to have to out produce the torque your 565 made, not just move
your 540's TORQUE an hp up in rpm...
"So new engines made more HP, but had less TQ, boat was a SLUG and would not even meet old speed let alone faster.."
saying that right there alone says you need ALOT more torque. I would think TQ alone is quite a bit more important than hp...your dynoes prove it.
Your 540 made more torque only "a couple a hundred more rpm" (540 more cam) more than your 565. So just moving your 540's powerband up in rpm alone isn't going to increase speed, unless your making considerably more TQ than your old 565......
But who knows, hopefully the new mills are making some crazy TORQUE and carry your boat well......
#140
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Tim has repeatedly said his old 565's were 2-3 mph faster. And when you look at the differences in the dynos it makes since.
If he would of put his 540 cam and afr heads on his old 565's i think he would of bettered his best mph. His 540's aren't making near the power his 565's were.
How do go you from old motor making X amount of hp and new motor making 34 more hp and go slower?
Could it possibly from old motor averaging (626) tq 506 hp and new motor only being (603) tq and 501 hp.
I'm sorry, but from the first time when i seen Tim went from the bigger cubes to the smaller one's i just couldn't figure out why.
Especially in a N/A engine. Boosted engine totally different animal. Especially when adding more boost and making the kind of changes like you have made.
Very impressive......
If he would of put his 540 cam and afr heads on his old 565's i think he would of bettered his best mph. His 540's aren't making near the power his 565's were.
How do go you from old motor making X amount of hp and new motor making 34 more hp and go slower?
Could it possibly from old motor averaging (626) tq 506 hp and new motor only being (603) tq and 501 hp.
I'm sorry, but from the first time when i seen Tim went from the bigger cubes to the smaller one's i just couldn't figure out why.
Especially in a N/A engine. Boosted engine totally different animal. Especially when adding more boost and making the kind of changes like you have made.
Very impressive......
as far as CI, I explained that in other reply, thx Bob M...