TPE-964 Engine?

[shadowrider]

my only consern is that nicasil.. heard lot about snomobile and dirt bike problems about durability with nicasil.. but riding is bit different les hostile and well.. very low hours compared snomobile or dirtbike..
is it big operation to do new nicasil over the old one.. and how easy is it to kill nicasil engine?

I would much rather have nicasil motor. Steel sleeves are old school. If you are into sleeding you would understand how durable nicasil is. My sled as over 2500 boosted miles running 14psi on 200+ horse 800cc 2 stroke. The nicasil still looks brand new. Wear item are the piston and rings, like they should be. When I saw this engine I was like finally!

 

[feartheride]

Yeah I wouldn't be too concerned about Nickasil as far as wear is concerned
I used to have an Arctic cat snowmobile that was air cooled and due too warmer outside temperatures I seized it at least a dozen times to the point where the motor would not turn over.
I would just let it cool down restart it and go
I had that sled 8 years and never had to take the motor apart once.
It's when things start coming apart that you have trouble with the bore

 

[Brian_216]

Please dont read into the few that had issues (or couldn't follow simple instructions and messed everything up) as with anything the rest of your setup needs to be in good working order as well. Since I got into skis, and going to free rides I have seen some setups that were so sloppy I have no clue how they ran. You can't just put a pretty engine in and expect magic. It comes down to the last wiring connection inside a salt corroded e-box, poorly maintained used carbs, cracked pfp chamber, bad spark plug boots etc. You know what I'm getting at. I'm not pointing fingers, but if you follow the tuning specs to the letter and the supporting items are up to par, you should have no issues getting it tuned in close enough to put a smile on your face. To the OP, I honestly don't know if you will find a large enough prop to work in a 140 pump. I think getting the pump dialed with that setup will be your biggest hurdle.

 

[NVJAY775]

Yup. I think the 140 won't be able to control the power. Most guys at sea level that have a good setup are maxing out the 144's.

 

[ChadGnarly]

Brian said it best.

 

[kevbo]

Easy to melt 95mm pistons in a two-stroke.

 

[LegDragger64]

I would like to see a version of this motor with 86mm bore x 76mm stroke. Would be all over it.

 

[ISeeWetPeople]

right now 140 is all i have if i buy engine i wont have money to buy new pump=) but it will be my next investment thats for sure
has anyone tryed 140 with 964. i heard lots of people said that 140 sethback magnum and 144 magnum are not so big difference?

 

[speedysprocket]

I ran a 140 mag behind my 950 that Erik built which is very similar in design and porting. It did alright. It should get you by. Don't let that stop you.

 

[DAG]

I was hoping it was a little higher, but these are the smallest domes TPE makes. I have a set for sea level, that I haven't had the chance to use yet dammmmit! LOL. What's your compression at? Elevation etc?

High compression is defiently nice. I defiently feel jipped as my TPE only had 160psi out of the box and slowly rose as leveled out at 165psi at 750' elevation. I thought they were suposted to have 180psi?

 

[bobob729]

High compression is defiently nice. I defiently feel jipped as my TPE only had 160psi out of the box and slowly rose as leveled out at 165psi at 750' elevation. I thought they were suposted to have 180psi?

But do u need it?? Runs great and has awesome power at 165 why complain

 

[Ducky]

But do u need it?? Runs great and has awesome power at 165 why complain

Who said it ran great?

 

[ISeeWetPeople]

How is it that few people has complains about pressure.. New engine and way under 170psi? If i would make these engines i would make sure that there i absolutly nothing to complain about. Don't think that the guy who makes this engine had this in hes mind tho.. And how about pressure testers and their differences.. Thats whole different thread.
Nice to know that 140can manage big power, so i don't have to sell my wife to get new pump.

 

[kevbo]

How is it that few people has complains about pressure.. New engine and way under 170psi? If i would make these engines i would make sure that there i absolutly nothing to complain about. Don't think that the guy who makes this engine had this in hes mind tho.. And how about pressure testers and their differences.. Thats whole different thread.
Nice to know that 140can manage big power, so i don't have to sell my wife to get new pump.

Your small pump will struggle more at low speeds, not so much once underway. The only complaint I have about this and all other PWC related product, is lack of information. It is difficult to decipher buzzwords and testimonials.

 

[ISeeWetPeople]

I agree.. You have to do so much serearch bu your self
What is best prop to 140mm pump with 964 any idea

 

[DAG]

But do u need it?? Runs great and has awesome power at 165 why complain

First off not complaining, but definitely bum'd giving up a good bit of power right outta the gate. You might say its only 15psi but think about it like this, people pay big $$ and run race fuel just to bump up 15psi, 180 to 195psi. I know of a few other 964's that have 160 psi also,(no one talks about) but I still dont understand why some guys get 180psi motors and others got 160psi? Low compression also does not help resale value so you get jiped on the front end with lower HP and on the backend with lower resale. Don't take a issues about a product as me complaining just sharing info and my personal experience. Even with this issue I'm still happy so that must say something spectacular about this motor. Even the "duds" are great

 

[DirtKurt]

why dont you get race gas domes?

 

[egbrig]

I stay off the boards now for the most part. As far as compression goes in an engine, a compression gauge is not how you build an engine. If your compression is off from the quoted rating are you sure you gauge is accurate? Would you put money on it? Unless severe damage has occurred how does one engine develop a certain comp number and the exact same setup miss by such a percentage? Gauge maybe? I would like to post my opinions of how compression and dome design are related but that would take several pages and I would still be told I'm wrong. It seems that the inner working of two strokes on many of the forums I have checked out have been so over simplified that the technical aspects that make them work are debated by faulty/lack of knowledge persons. Be wary of those that make simple statements of how things work, there are too many of those guys posting. Can we raise compression on the 964? Yes, but who will stand behind the engine when bad gas or poor tuning (those who do not follow directions) and/or lack of mechanical skill-- are at fault. I believe in pump gas and simplistic/reliability. With such a big bore the combustion event has less room for error.

 

[DAG]

Erik I gave you the motor back for 2 weeks and said it had 160 psi with my gauges (all three). What did your gauge read?

 

[ISeeWetPeople]

I stay off the boards now for the most part. As far as compression goes in an engine, a compression gauge is not how you build an engine. If your compression is off from the quoted rating are you sure you gauge is accurate? Would you put money on it? Unless severe damage has occurred how does one engine develop a certain comp number and the exact same setup miss by such a percentage? Gauge maybe? I would like to post my opinions of how compression and dome design are related but that would take several pages and I would still be told I'm wrong. It seems that the inner working of two strokes on many of the forums I have checked out have been so over simplified that the technical aspects that make them work are debated by faulty/lack of knowledge persons. Be wary of those that make simple statements of how things work, there are too many of those guys posting. Can we raise compression on the 964? Yes, but who will stand behind the engine when bad gas or poor tuning (those who do not follow directions) and/or lack of mechanical skill-- are at fault. I believe in pump gas and simplistic/reliability. With such a big bore the combustion event has less room for error.

Good answer
I do think that i rather run lower compression for long time than broke it.. Even im not the one who just ride like nut with no intrest to keep tje ski mint..