viper 780 835 or 900 ?

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xviperx7

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best kit for a viper 780 BMP 780 Hauck 835 Bender or 900 stroker from hauck anyone have the hp numbers also whats the best pipes to run with these and can they run on pump gas? :bling:
 
BMP's claims for hp ratings are the following:

-BMP 780 trail kit, they claim 170 hp (I would say 160-165 at most) - $2295 USD + pipes
-BMP 780 lake race kit, they claim 177 hp - $2595 USD + pipes
-Hauck 900 stroker kit - $4299 + pipes - 190 hp would be a guess.

PM Buffalobob for Bender 835 pricing.
 
For trail riding, sure. I trail ride mine and get 15 mpg.

Mine isn't really a kit. It started out as a basic 780 top end, then the cylinders were ported fairly heavy, and the cases were ported as well. I run Bender 835 pipes on mine, and 38mm carbs, and it peaked at 181hp on the dyno. Of course, the 835's can make more power because they are a bigger motor.
 
will all these mods run on pump gas 91 octane? and can you port the 900 stroker to gt even more power say 200 hp?
 
If done properly, I would assume a well setup, fairly heavily ported 900 stroker to make an honest 195 to 200 hp on pump fuel.
 
what needs to be done to make it run on pump gas and does hauck do good work that will allow to run on pump gas? as for skid what would you reccomnend for a skid stock or something else? what kind of numbers does that 1136 put out valin? and whats the speeds for the 780?
 
What are you planning on doing with the snowmobile you are building? Hauck can do good work, but others can as well, and probably cheaper. Call Iantomasi. They'll build you what you need.


Numbers? The 1136 makes 270hp, 150 ft. lbs. of torque.

The 780 ran 128.7 mph in 2000' in a full trail setup. It currently holds the record in the 800 Improved Trail class. Traction is a big issue.
 
below is my dyno sheet from dynotech on my bender 835 srx. this was on mobil 93 pump gas & 2500 miles on the motor.

SRX with Bender 835 big bore with DynoPort pipes (this was 140 HP stock)
EngSpd STPTrq STPPwr BSFC B Fuel B AirTmp STPCor BaroP
RPM Clb-ft CHp lb/hph lb/hr degF Factor in/Hg
7000 107.3 143.0 0.783 111.5 46 1.004 29.66
7100 106.5 144.0 0.779 111.9 44 1.002 29.66
7200 106.5 146.0 0.782 114.4 41 0.999 29.66
7300 107.5 149.4 0.777 116.4 40 0.998 29.66
7400 108.6 153.0 0.751 115.2 40 0.998 29.66
7500 111.1 158.6 0.725 115.4 39 0.997 29.66
7600 111.1 160.7 0.726 117.2 39 0.997 29.66
7700 115.2 168.8 0.705 119.4 39 0.997 29.66
7800 114.7 170.3 0.691 118.2 39 0.997 29.66
7900 116.5 175.3 0.664 117.0 38 0.996 29.66
8000 120.1 182.9 0.643 118.3 37 0.995 29.66
8100 119.8 184.7 0.646 120.1 37 0.995 29.66
8200 119.1 185.9 0.644 120.5 37 0.995 29.66
8300 121.1 191.3 0.618 119.0 37 0.995 29.66
8400 121.4 194.1 0.622 121.4 37 0.995 29.66
8500 119.8 193.8 0.627 122.3 37 0.995 29.66
8600 118.1 193.3 0.615 119.7 36 0.994 29.66
8700 115.7 191.7 0.615 118.9 35 0.993 29.66
8800 113.8 190.6 0.619 118.8 36 0.994 29.66
8900 110.3 187.0 0.627 117.9 37 0.995 29.66
9000 106.8 183.1 0.634 116.7 37 0.995 29.66
 
i plan on trail riding it with the occasional radar run iantomasi has the stroker? will they port it to if ask and whats there price thanks
 
Iantomasi can build you anything you want. The price varies upon the application. I don't know how much they would charge. It would be expensive.
 
Nope. You'll have to call them. It would save you alot of time and questions on here to just go straight to the source.
 
Gerry Iantomasi 905-263-4868. I talked to Gerry today and what a nice, straight foward guy. I threw alot of ideas his way today reguarding building a trail monster. Most of my ideas involved the 780 vs. the 700. My original set up was going to be a Simmons 780 kit W/ the carbs., heads, cylinders, case, and exhaust manifolds all ported with stock pipes, stock CDI, and a bender silencer. He said when the 700 and the 780 are set up identical the 780 only produces aprx 2-3hp more on the dyno (for the trail set up sled). So for the money, parts, reliability, and manurism the 780 is not worth it. He priced me 100.00 per head, 250.00 per cylinder, 350.00 for the case, and 100.00 per carb. That is the price for a 160-165hp Trail SRX 700 by Iantomasi.
 
I looked into big bore SRXs and both Aaen and Bender talked me out of it. They both had similar opinions to Iantomasi. The resultant wall section remaining after boring is quite thin and the combustion O-ring is dangerously close to the flame front. You have to weld up the top of the jug and recut the O-ring groove to provide more land area, and this is rarely done with 780s.
 
Essarex said:
The resultant wall section remaining after boring is quite thin and the combustion O-ring is dangerously close to the flame front. You have to weld up the top of the jug and recut the O-ring groove to provide more land area, and this is rarely done with 780s.
Click to expand...

I have never had an issue with o-rings, nor have I heard of that becomming an issue. There is still more than enough meat from the cylinder wall and the o-ring groove. However, you are correct by saying the cylinder walls become very thin when bored. This why the 780's tend to crack between the main exhaust port and booster ports if you hurt the motor. This is where the 835's are far superior, as they are sleeved, and retain a thick cylinder wall.
 
00SRXWHERRY said:
Gerry Iantomasi 905-263-4868. I talked to Gerry today and what a nice, straight foward guy. I threw alot of ideas his way today reguarding building a trail monster. Most of my ideas involved the 780 vs. the 700. My original set up was going to be a Simmons 780 kit W/ the carbs., heads, cylinders, case, and exhaust manifolds all ported with stock pipes, stock CDI, and a bender silencer. He said when the 700 and the 780 are set up identical the 780 only produces aprx 2-3hp more on the dyno (for the trail set up sled). So for the money, parts, reliability, and manurism the 780 is not worth it. He priced me 100.00 per head, 250.00 per cylinder, 350.00 for the case, and 100.00 per carb. That is the price for a 160-165hp Trail SRX 700 by Iantomasi.
Click to expand...

Gerry and Flav are great guys, and are excellent engine builders and tuners. You will not be dissappointed with any work done by them, and that is a good price. I figured it would be around $1000 Cdn. for top end work. 160hp in an SRX is a stout SRX. You will be pleased. Good luck with the build.
 
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