Whos Running GP800 motors?

[Yamah0]

Like some of u might know, i ordered an XFT ski, and it should be arriving very soon. My plan was to just swap my motor and electrics from my current ski and put them in the XFT then just sell my SJ complete without the motor.

Then lately iv been thinking to maybe keep my SJ and get an 800 motor to shove it in the XFT. What do u guys think/ recommend. Is it a stupid idea to keep my SJ?

What is all involved in running an 800 motor? How reliable is it? Is it heavier than the 701? Talk to me...

Thanx in advance:woot:

 

[Eleven]

Well the 800 has two major issues, the first one is the PVs, fixable by getting either gas valves (watch out stock pipe) or billet electric valves.

The second one is that the 800 has sidedraft carbs that are very low in the hull and very prone to water ingestion.

 

[waxhead]

i think that waterdawg makes a manifold to make the carbs mount in the evertical manner

 

[Yamah0]

wow not sounding too good already... seems like it needs a bunch of work done before fitting! How much will all things necessary to run it cost? Is it really worth it and how does it compare to a setup like mine?

Thanx
Zane...

 

[superramjet]

800

It's an insane amount of fitting and testing to get it working. I finally have a setup that out performs my previous best setup (team scream 5mm stroker) but it took several years to get it there. The support and custom parts are not out there for the 800 platform. You can ask the top engine builders about a 62t setup and get something that will run well right off the bat. You ask the same builders about the 800 motor and none of them have messed with it or can give you any advice on it. If I could just call Paul and get a setup like he does to the 62t motors on the 800 platform, I could have saved hundreds of hours of testing, building and tuning. (Most guys don't realize how much that knowledge is worth, we are very fortunate that we can call him for advice) Once you get the motor to fit you're only half way there because it's hard to get a pump setup to work. I'd recommend going with a proven 62t platform in your xft to save time and try to put the motor in your old hull so you still have something to ride during the couple of years it takes to get the conversion right. I'm pleased with the power my ski is making now but still anticipate a full season of testing and correcting before i'm at a stage equal to my previous setups in reliability.

My motor is currently a 950cc set-up and I have plans of running even larger custom cylinders before Lanier. I'm using a 148mm mag pump (which requires a bunch of modifying to install also). While the motor produces similar horsepower to radical 62t motors the torque is considerbly more. I plan on running this platform from now on. The motor and pump is heavier but in my new hull I anticipate it to be lighter than any thing I've run before.

 

[Mile9c1]

I plan to run a GP800 motor this year (cross my fingers) I'd depending on Waterdawg for the pipe. I can make my own intake manifold, so I'm not worried about the carbs.

As far as weight goes, the bare 800 longblock with no front cover weighs 70 pounds (I just shipped one to Germany). The crank is almost 30 pounds by itself, and the front cover has to 3-4 pounds heavier than the 62T cover (it's really beefy and it incorporates the "bedplate" for the front mounts. The cylinders and head weigh about the same as a 62T setup (or maybe slightly less because they don't have iron sleeves and you don't have to run a girdle head on them). Overall I'd guess the complete 800 setup is 20 pounds heavier, stock vs. stock.

Superramjet is definitely right that it's a ton ton easier to run a modified 62T setup and be happy with it. When I bought my X-Jet I never planned to run an 800 in it, but I think it will be fun to tinker with.

 

[unclehulka13]

will the 800 drop in an xft hull?

 

[tricky1]

It's an insane amount of fitting and testing to get it working. I finally have a setup that out performs my previous best setup (team scream 5mm stroker) but it took several years to get it there. The support and custom parts are not out there for the 800 platform. You can ask the top engine builders about a 62t setup and get something that will run well right off the bat. You ask the same builders about the 800 motor and none of them have messed with it or can give you any advice on it. If I could just call Paul and get a setup like he does to the 62t motors on the 800 platform, I could have saved hundreds of hours of testing, building and tuning. (Most guys don't realize how much that knowledge is worth, we are very fortunate that we can call him for advice) Once you get the motor to fit you're only half way there because it's hard to get a pump setup to work. I'd recommend going with a proven 62t platform in your xft to save time and try to put the motor in your old hull so you still have something to ride during the couple of years it takes to get the conversion right. I'm pleased with the power my ski is making now but still anticipate a full season of testing and correcting before i'm at a stage equal to my previous setups in reliability.

My motor is currently a 950cc set-up and I have plans of running even larger custom cylinders before Lanier. I'm using a 148mm mag pump (which requires a bunch of modifying to install also). While the motor produces similar horsepower to radical 62t motors the torque is considerbly more. I plan on running this platform from now on. The motor and pump is heavier but in my new hull I anticipate it to be lighter than any thing I've run before.

Lookin good Tom. Keep up the good work. Cant wait to try it at Lanier.

 

[SUPERJET-113]

:hail: I'm speachless Tom, thats a work of art you have there.:hail:
I know you've been perfecting that set-up for how long now? 2-3 years? Way to go man!


I went through Hutch around Thanksgiving time(05')and was thinking about looking you up just to see that beast in person. Probably be out once this summer to visit friends and family. I would like to see a X-jet in person too.

 

[sflsurfrider]

DAMN TOM! nice!

how wide are your side rails? im counting at least 6 diamonds wide on the turf....

or is that an xjet with wings?

 

[Mile9c1]

That's his 2005 X-Jet (with side extension option) :wink:

 

[waxhead]

it looks awesome i want one

but it looks like a lot of work fitting that engine in there
and the 62t bolts in

 

[Mile9c1]

I don't think it's too bad, it's the same width and only about 3 inches longer than the 62T engine. You'd need to glass in the front engine mounts, and run a 550 gas tank. The engine slants to the left, so the carbs are super easy to work on (they are spaced wider than the 62t carbs as well). The pipe is easy to work with, it's just a manifold and a chamber... even simpler than the B pipe.

 

[vomitspot]

mile shoot us some pics
ramjet you too more pics

 

[Mile9c1]

I haven't started working on my ski yet, I'll start a buildup thread when I do.

 

[superramjet]

:hail: I'm speachless Tom, thats a work of art you have there.:hail:


I went through Hutch around Thanksgiving time(05')and was thinking about looking you up just to see that beast in person. Probably be out once this summer to visit friends and family. I would like to see a X-jet in person too.

I can't believe you didn't look me up. We went riding the day before and day after thanksgiving. Make sure you call next time. I'll always have an extra ski you can ride while you're here.


I've changed alot of things since I rode it a couple of weeks ago. I don't know how it runs now, I'm waiting for the ice to melt. This thing was bare hull just a couple of days ago because I ended up changing lots of things. I plan on taking it to Galveston so I can at least see how it runs before it gets gutted and moved to the new hull.

Pics are from 2 weeks ago before I redid many things.

 

[Yamah0]

Wow.. thats definetly alot of work... dont think i have that much patience to wait that long to get a ski run right...

I guess im sticking to my setup then go Lamey when i need more powa..

Thanks for your replys fellaz!

Zane.

 

[Shonuff]

What's wrong with the 1200? Why not shoot for the stars?

 

[Mile9c1]

Which 1200? There's at least 1 guy who put the non-pv 1200 into a Superjet (Carmine on pwctoday.com).

I think it has more wow factor, but it's less practical... heavier, bigger, not much more powerful. It looks like it'd be a huge PITA to work on. The 800 doesn't look much (if any) more difficult to work on than a 62T engine.