Hey guys, I know you have been asked this question a thousand times but I am at a loss. I have had this 87 Pachanga 22 for over ten years and have been chasing the speed barrier ever since. I have a 502 crate fitted up now with a Bravo1. the motor started as a 450 horse crate motor but since its first couple of years I have rollered it with the 232/242 cam and roller rockers. Shaved and unshrouded pocket ported the orig. rect heads. I still cannot get this beast above 75mph.I am using the original Tbolt IV ignition. I have a hydromotive 22inch 4 blade. This year I added Dart Iron eagles with mild port job and beehive springs. and still 75 mph. The boat runs beautifully and strong but acts like something is holding it back?? Im running a Holley 950 hp dblpmpr which I added at the end of last year. (proform mainbody w/ 850 meters and bowles. Im about to change ignition fearing a limit to this ingnition. My WOT is now 5200 +- Help!!
What is limiting my rpm???
quick22
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Hey guys, I know you have been asked this question a thousand times but I am at a loss. I have had this 87 Pachanga 22 for over ten years and have been chasing the speed barrier ever since. I have a 502 crate fitted up now with a Bravo1. the motor started as a 450 horse crate motor but since its first couple of years I have rollered it with the 232/242 cam and roller rockers. Shaved and unshrouded pocket ported the orig. rect heads. I still cannot get this beast above 75mph.I am using the original Tbolt IV ignition. I have a hydromotive 22inch 4 blade. This year I added Dart Iron eagles with mild port job and beehive springs. and still 75 mph. The boat runs beautifully and strong but acts like something is holding it back?? Im running a Holley 950 hp dblpmpr which I added at the end of last year. (proform mainbody w/ 850 meters and bowles. Im about to change ignition fearing a limit to this ingnition. My WOT is now 5200 +- Help!!
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3,736 Posts
Welcome to SW!
Sounds like you have plenty of power. Have you ever held a straight edge up to your bottom? Take a 4' level and hold it up to the last 4' of you hull. You probably have a hook that was purposely added to the bottom. It's like putting your tabs down. It lowers your RPM.
Those boats were never intended to run 75+.
Sounds like you have plenty of power. Have you ever held a straight edge up to your bottom? Take a 4' level and hold it up to the last 4' of you hull. You probably have a hook that was purposely added to the bottom. It's like putting your tabs down. It lowers your RPM.
Those boats were never intended to run 75+.
I realize that this boat originally had 65mph in mind and I also realize that I am riding in dangerous territory but that is part of the thrill. It still doesn't tell me whats limiting the top end. The bottom edge of the transom flares in two small places towards the water, creating natural trim tabs.(part of the design) This shouldnt be enough to slow it that much.
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2,306 Posts
Those wedges in the hull play hell on higher speeds! I bet that has ALOT to do with the wall your hitting in top speed.. The 272 formulas have it too, and it is very hard to get much past 70 in these things.. you can throw tons of HP at them, and only get a bit more speed..quick22 said:
You can have a good fiberglass shop grind out, and smooth the hull to get rid of those factory wedges, but im sure you'll get negative effects at lower speeds...
Ron
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6,772 Posts
At higher speeds there isn't enough of those "wedges" in the water to worry abouteyeinstine said:
(see illustration) Since the boat is an '87 , my bet is you have a low X dimension and are dragging a lot of outdrive in the water. A guy on here from Canada with a 242 Formula raised his 3" and picked up 5 to 6 mph if I remember correctly.Attachments
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2,306 Posts
Well, i guess once you haveMopower said:At higher speeds there isn't enough of those "wedges" in the water to worry about
enough power, and can motor past that point and get the whole boat out of the water, then they wont be an issue.. :laugher: :laugher: nice pic Cal!! What props you running now???
Ron
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6,772 Posts
Most late 80s boats still had the cavitation plate at the bottom of the boat. Now days its an inch or two (or more) above the bottom. My cuz has an 05 Fountain and his prop shafts are even with the bottom
BUT it also takes him half a mile to get on plane
I only wish "shortys" were in my budget
BUT it also takes him half a mile to get on plane
I only wish "shortys" were in my budget
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2,306 Posts
Nice! Why not run the bigger props for the better cruise then?? and lower the RPMS.. Or will RPMS be below max HP rpm?Mopower said:Right now 26 Bravos at 5700 rpms
Got any 24 bravos laying around i can try?
Ron
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2,306 Posts
Mopower said:
Luv the 30s they give me 51 mph (GPS) at 3000 prm
Biatch!
:laugher: :laugher: :laugher:
So far the 25 Mirages are the best for me, getting 41-42 mph cruise @ 3000 rpms..
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6,772 Posts
Thats what mine did too with 454s and 25 Mirages. The 28s get me near 50 and the 26s about 47mph. Yet with the 26s over 5500 rpm the engines take on a whole new sound. Much less labored...they kind of quiet down and just spin. They dynoed 647 @ 5700eyeinstine said:Biatch!
:laugher: :laugher: :laugher:
So far the 25 Mirages are the best for me, getting 41-42 mph cruise @ 3000 rpms..
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