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Permanently Removing RAVE System

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Skidoodle

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This question has probably been asked before, but here goes. Would it be possible to remove both RAVEs from a 787 and install a block off plate. Has anyone tried this? What was the result? Not that I was wanting to do it, but it might be more economical than replacing all that stuff even if you did suffer a slight loss of power.
 
I have not seen it asked but I imagine it has been. Just before my time of joining the site.

The raves are critical for power along the band of the engine RPMs. So even if you could, it would come at a substantial loss in power i would think.
 
Probably not a good idea, the RAVE valves function across the whole power band, you would probably loose at least 20HP, more than a slight loss of power.

Lou
 
Since the raves open at above 5000 or so rpm, any rpm below that would suffer, in otherwords the ports would be too big. Not sure if it would even run without the raves, if it did the bottom end power would suck.
 
The raves are a great idea by bombardier, idk why everyone always hates on them. Takes like 20 minutes to clean them a year and you may have to replace them every 10-15 years and they add tons of hp
 
Don't misunderstand, no hate here, just simple curiosity. I see that nobody has tried it, so nobody knows for sure. Maybe I will. If I do, I will be sure to let everyone know how it turns out.
 
Well you know, I actually started another thread asking about where to set the caps and thats what I played with today.

I tried without the springs in place and they open completely just after idle and on mine I didn't notice any difference after 4500, which is where they kick in anyways.
But below that it was rougher and louder up to 4000, so in my opinion it either changed the powerband or maybe i was just being to easy on it because it felt wrong.

Only thing I can compare it to is having a big camshaft in an engine vs a normal one. Its rougher from the start.
 
Seems to me that even though you lose the obvious HP gain they create, you would also rob lots of remaining HP as mentioned above. You have to remember that the cavity that the blade normally sits in would now be completely vacant meaning an increased size of the combustion chamber thus less compression. The blades don't move much anyway so I would be willing to bet adding that much open area and it wouldn't even run. That much volume would probably be equivalent to raising the head 1/8 or maybe even 3/16 from where it normally sits. You could always just block them down so they wouldn't move.
 
IMO it would be rediculous to remove the RAVES, Bombardier spent the time and money developing them and they work very well. As stated above, they are very easy to clean and maintenance.

My suggestion would be to leave them as is, you could just be opening a whole new can of worms/problems by removing them..

My 2 cents
 
But you see, I can't clean or maintain them when they are broken and everything is melted and has to be replaced.
 
AHHHH now the truth comes out. :thumbsup: Just hit up Minnetonka or one of the many others on this site that sell used parts and get what you need.
 
Over time the housing and slides wear out. It just happens, most of these parts are 17 years old. Pretty good reliability if you ask me. When the plastic parts keep melting it is just time to replace the housing and or slides and start fresh. Hot exhaust gas escapes by and melts the piston and cap. It will cause you alot less hassle to just go ahead and replace these parts.
 
I've refrained from making much of a comment about this thread. But like most everything else, cars, trucks, boats, SeaDoo's, the manufacturer generally knows more about making their product that I do. I learned this at an early age when I put high performance heads on my Camaro, the bottom end lasted maybe 3 months.

So for the recreational rider, I believe in leaving things alone, with maybe the exception of a performance intake grate and impeller. If you don't want to be bothered with the hassle on cleaning and servicing rave valves, sell the ski and get a non-rave valve engine. Personally I think the hassle is well worth the extra 25hp, but to each his own.

Lou
 
Ok. I withdraw the question. I didn't know it would offend so many on here if I asked a simple question. I will fall in line and throw another $300 into a $1500 ski and ride along with the sheeple. Thanks for all of your help.
 
i don't believe you offended anyone! but gets frustrating when the advice is questioned over and over. i don't offer advice unless i am absolutely sure i know what i'm talking about. and am sure everyone here feel the same way. (a wealth of knowledge here btw)
the kidding around here is an example of what happens when you remove vital parts because of a melt down. every part is there for a good reason. removing the raves is like pulling a valve from a cylinder head because it's bad or a spark plug lol! hence is why i love this forum! a great bunch of guys eager to help but also have a great sense of humor!
i personally would just rebuild the rave system right and be done with it.(very easy) modding will only buy you trouble.
 
Agree with jamming. No offence here. I think most just don't understand why you would do that that's all.
 
I've refrained from making much of a comment about this thread. But like most everything else, cars, trucks, boats, SeaDoo's, the manufacturer generally knows more about making their product that I do. I learned this at an early age when I put high performance heads on my Camaro, the bottom end lasted maybe 3 months.

So for the recreational rider, I believe in leaving things alone, with maybe the exception of a performance intake grate and impeller. If you don't want to be bothered with the hassle on cleaning and servicing rave valves, sell the ski and get a non-rave valve engine. Personally I think the hassle is well worth the extra 25hp, but to each his own.

Lou
I doubt the bottom end failed due to the head swap. I have done several high performance head/cam swaps on a few camaros and vettes never has one engine failed. We even had a 06 z06 with ported/shaved heads, cam and a 300 shot of nitrous and the only problem was a broken valve spring. And right now I'm doing a head/cam swap on my friend's camaro with about 90k miles on it. The majority of the miles have been abise and nitrous shots
 
Search stock OEM part numbers on eBay and you can usually find new parts wayyy cheaper than buying from big companies like Sbt. Just try that out first, it's the offseason so ppl may want to get rid of good stuff cheap
 
DANGIT MAN!! Get those darn grey fuel lines out of there

Or a RAVE issue will be the least of your worries haha
 
no worries, if you get tired of throwing $300 at a $1500 ski, you can always buy a new Spark for $5,000 :)

I stopped rebuilding and flipping 951s this year because of the Spark. I'm concerned that no one would buy my $3k 3 seater with a new engine, when a NEW ski, that's not 12 years old, with warranty starts at 5k.
 
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