Polaris snowmobiles

Can anyone give me an accurate HP and torque for a 1000 HTG motor stroked 70 mm?

 I have a dyno sheet that says 259 hp and 146 tq.

Who's dyno would that have been on? 

 

Pat....I'm looking at mine from a few years ago.....dynoed on Rob's Huff tech.....it made 262hp, 149.9 torque @ 9200 rpm

Thanks, I dynoed mine yesterday at Iantomassi's and it made just shy of 240 hp, 128 torque @9800 rpm.  Could there be that much of  a variance from one dyno to another?

That is almost in line with non stroker #'s....that is strange....

I have to say there is some component that is not happy. You need to make sure it is a 70 stroke motor for sure...why is it spinning 9800? How old is it? Pipes? Storm base or XCR? Peak power on that motor should be at a much lower rpm for sure. Once tuned properly after you degree and blueprint everything it should be a good motor for you.

Storm or xcr bottom?  Did you play with timing?  looks like you need some by the RPM were you made power. Unless you have the Jaws Pro max pipes.

I have checked the stroke, it is 70 mm, and it is fresh, it is a storm bottom end with Jaws pipes, it has had compression taken out of it to run 1000 feet, the CDI box that I got with it when I bought the motor would not fire on number 3, replaced with a '96 storm box. Rob said to grind the stater and give it more timing until it made good power, before the compression was taken out it made its power at 9200-9400, so maybe a combination of taking away compression, not having the right CDI box or maybe not having the stater advanced enough may be causing this problem. Also was told the motor made 265 hp on Rob's dyno before I purchased it.

Pat....sounds like Gerry and Flav want to sell you some Christmas horsepower LOL.....somethings off for sure.....say hi to the boys for me....happy holidays....

Are you on Pumpgas???? My full race 1000's had 1000' plus in a radar run no pproblems....not even chasing it 140 plus mph....

I am running C16 fuel. 

What compression are you guys running to get those hp and torque numbers?  What CDI box works best with the storms?  Mine is a digital ignition, the bigger box, 96 and up.

       I would just lend this advice. Disassemble the motor, get a degree wheel on and interpret all the vital info. Then look at the pipes, carbs, stinger diameter, squish configuration, carb flange design etc. All are important to a happy motor. I can not say which ignition is "better" but I can say the old 3 pulse stuff works just fine.

     Why do you soften compression in 1000'? C-16 seems adequate to handle up to 16:1 in 1000' I would think. Did you dyno test any different fuels? C-14 or 14 plus? Who completed the case porting for this motor? Many variables to consider, but most certainly this motor should be stronger than the dyno numbers from Iantommasi's. And I know they have made many dyno laps, and have also built many strong strokers such as Benji's. Did they offer any advice or input? Good luck.

Check your CDI #  part # should be CU7302 and matching flywheel #FP9305  for 96-98 storm ignition. C-16 is too much octane for your motor now.  Do installed head volume cc check to see what your full stroke compression is now. Find top dead center with dial indicater fill spark plug hole with oil with syringe from drug store keeping track of how many ML of oil you place in combustion chamber. Fill to top of spark plug threads and minus 2ml. for spark plug. Now add 335 which is your clyinder volume and the # of ml you put in chamber,  and divide answer with head volume again.     EG:  335 plus 25 = 360    then divide by 25 = 14.4  comp. ratio     Gerry is very smart man I am sure he can help you out.

Gerry said it didn't need that much compression for my application (1000' speed runs).  We didn't dyno with any other fuels.  I assume that HTG did the case porting, this was apparently one of Rob's personal sleds that he won Hay Days with in 2000 or 2001.  Gerry says that this is all that it should have as far as HP goes and I had been told that previously it was dynoed at 265 hp. so I wondered why the difference.  Has anyone had a motor dynoed at both HTG and Iantomassi's?  Do dynos vary that much usually from one to another? 

I have been on Jaws, HTG, Iantomassi's, dynotech dyno's all will give you a different hp number. The main thing is you now know were the power band is, and the correct BSFC for jetting!  Dyno's do not win races they are just tuning aid.  I have seen hp # from 240-274 on HTG 1000 stroker's.

Obviously this motor was set up to run with this compression and timing, so do I put it back that way or give it a try the way it has been set up now, but that isn't going to have me running along with the sleds that are 260+ hp.

 I sent you an email. Timing is critical on that engine and you can easily give up 20 hp just by running the wrong timing.

Id say you shouldve just freshened that motor and tried dynoing it, obviously if it made that kindve HP. before and was robs motor he won with you mustve made some changes the motor didnt like and therefore are seeing lower numbers, less compression alone will give less HP.  Thats probabally to much octane for that motor too,  try 114 or even 112.