port or big bore.


780's are very reliable when DONE right so is porting.
The 780 will make roughly 10hp more than porting but a lot more torque.
 
I JUST PICKED UP 2000 SRX CYLINDERS THAT LOOKED TO OF BEEN PORTED BY MEGA- POWER ( mark giametti). NICE JOB BY THE WAY. APPEARS TO BE LAKE RACE PORTED. I WILL KNOW FOR SHURE AFTER I MIKE EVERYTHING UP. 3:16 (yammie tony)
 
if $$$ is an issue than go with porting. a good port job will net almost as much h.p. as a 780 & a lot less $$$. my srx with bender can & porting was 162 h.p.. my IS700 srx was 191 h.p.. if $$$ is not a problem than the 835 is the way to go.

bob
 
Get a hold of Mr Viper on here, and tell him what exactly you want it to do when done. He can do either for you, and in my opinion is one of the best in the biz. He is also very competitively priced. Maxdlx
 
Couple things left out that are worth mentioning, the 835 also requires aftermarket pipes to make that power, thats another $1100.00 U.S., also larger carbs(38mm)they are not cheap engines by any means to build. A 780 can make darn near as much power as a 835 if your using stock pipes, will also run well with stock carbs. Using stock pipes becomes more of a issue with states like Wisconsin and now New York on the aftermarket pipe laws.
Another thing is to consider a 835 is a steel sleeved engine, they cant be run as lean and safely as a 780 can, the sleeves dont dissapaite heat as fast as a nickasiled cylinder does. This requires a richer mixture to help keep the piston crown cooler from the lack of the heat being pulled away from the sleeve. A good trail rideable, pumpgas, 780 will be a healthy 165+hp, and they are plenty reliable if set up and tuned in correctly. The biggest mistake made is lack of warm up time.
A ported 700 can be a very,very good runner, if done correctly a good solid 155+hp in trail form, lake race form can be just about same hp output as a 780 but the 780 makes more torque! Torque is what you feel when you pin the gas! That being said theres lots of options to go, it all depends on your wallet size as to the direction you go in. You wanna play you gotta pay, just like every other form of motorsports there is!
 
an 835 with stock carbs, stock comp. & timing, & no case porting makes 178 h.p. - with bender pipes. the added expense is the pipes. add 38mm carbs - case porting & v-force2 reeds & the power goes up to 190 -200 h.p. depending on timing & compression.
boring a 700 to 780 & renickasiling the cylinders actually weakens the cylinder by removing necessary support material. this practice can lead to engine failure due to warpage under extreme load conditions. the steel sleave reinforces the cylinder & gives added strength.
cooling is a very important factor to consider when modifying any engine. horsepower builds heat & more power builds more heat. i was part of the r&d @ benders for their tunnel heat exchanger package. every sled i have used this on in addition to the stock heat exchangers has never had an engine failure!! i reccommend this cooling package for any power enhancement modification.
never add fuel to compensate for inadequite cooling. the only thing that will happen is you will lose h.p.. --- always add cooling capacity.

bob
 
Last edited:
mrviper700 said:
Couple things left out that are worth mentioning, the 835 also requires aftermarket pipes to make that power, thats another $1100.00 U.S., also larger carbs(38mm)they are not cheap engines by any means to build. A 780 can make darn near as much power as a 835 if your using stock pipes, will also run well with stock carbs. Using stock pipes becomes more of a issue with states like Wisconsin and now New York on the aftermarket pipe laws.
Another thing is to consider a 835 is a steel sleeved engine, they cant be run as lean and safely as a 780 can, the sleeves dont dissapaite heat as fast as a nickasiled cylinder does. This requires a richer mixture to help keep the piston crown cooler from the lack of the heat being pulled away from the sleeve. A good trail rideable, pumpgas, 780 will be a healthy 165+hp, and they are plenty reliable if set up and tuned in correctly. The biggest mistake made is lack of warm up time.
A ported 700 can be a very,very good runner, if done correctly a good solid 155+hp in trail form, lake race form can be just about same hp output as a 780 but the 780 makes more torque! Torque is what you feel when you pin the gas! That being said theres lots of options to go, it all depends on your wallet size as to the direction you go in. You wanna play you gotta pay, just like every other form of motorsports there is!
Click to expand...
JUST SO I UNDERSTAND BECAUSE I AM DOING THIS. LAKE RACE PORTED 700 SRX CYLINDERS WILL GET YA 20 HORSE ? WHICH IS 165!!! DON WOW. THIS WITH STOCK CARBS AND PIPES. 3:16 (yammie tony)
 
my 780 srx with 175 lbs comp. made 194 hp, and did not do to bad on the asphalt.
 
I HAVE SEEN ALOT OF VERY FAST 780 SRX,s AND VIPERS AT ALL THE BEST ICE SPOTS IN NY. ONEIDA, BIG MOOSE, LANZI,s, etc. MATTER OF FACT, JUST TO NAME AFEW BESIDES TYLER,s, THE HAMMER ( mark micari ) MV1000 ( mark viccio) AIRWOLF ( very fast 780 viper) etc!! 3:16 (yammie tony)
 
Tony, the lake race set up, includes case porting to get to that level.

Bob, thats what my point was, a 835 also takes a extra $1100.00 to get up to the power level over a 780. If you ran stock pipes,stock everything on that 835 topend it would not make any more power then a 780.
 
Last edited:
I have a 835 with Bender's bigbore pipes and a set of 38mm carbs bored to 40mm and the timing bumped up. Let me tell you this thing is a very strong runner. I have mine set up for the ice and grass and it does very well. I would recommend this BB to anyone.
 
You must log in or register to reply here.


Back
Top