Big Bore paired with Indy long-rod crank, would this work?!

[Powderforlife907]

I guess while you see it as a degrading post I see it as a little ribbing and non offensive.

That's the one thing you have to be weary about with dealing with customers(any one really) . Every one will take it a different way... Especially on the Internet!
RKT I am not saying loud handle is not in the wrong at all. Just take some time in the shop and come back level headed.

 

[jeepin270]

Kelsey, did u ever get around to answering the question at hand? How will ur bigbore perform on a L.R. bottoms end??

 

[xcmark]

I Not trying to steel any thunder from RKT or Indy Dan or hijack this topic , just helping explain

If the rod length is changed the piston pin location or the jug would have to change its installed height . So running a .125 longer rod would require the piston pin to be moved higher in the piston OR some combination of alter jug installed height and piston pin height. So the combo of each must almost match the length of the rod change. This would alter the port timing and have some effect on the power band and running compression. I am not saying it cant be done but its unlikely you will find two different shops willing to work on the motor design as a team. If RKT and Dan teamed up for a long rod big bore custom cast Jugs like Carls is doing I could see that motor making well over 200hp and not needing pistons ever 1500 miles like Carls suggested on there old 900cc kits . As stated in many other post the long rods take some of the stress off the piston skirt and lower jug. Long rods also add some TQ due to the dwell time at TDC and the angle of the crank pin and piston pin.

 

[wfieldin]

Wouldn't that be a Peach

Well as title says, wouldn't that be a peach: all this Forum bantering to end up with two Polaris engine guru's getting together and giving us a true 200 hp engine that is reliable with a 3 year warranty! Where do I send the deposit?

 

[diamonddave]

Hey, how about that retract that you are glad to perform?

In answer to your question.. My pistons are very close to the same size as the stock pistons.. The stock piston also give proper piston to cyl clearance when new... the problem is that they do not stay the same size or shape for very long.. nor do the Wiseco pistons..

One needs to have pistons that will maintain their "shape" and size after continuous running and many miles.. this is where the difference lies...

What experience do you have with wiseco piston's in the CFI 800 Polaris? And why the unneccesary and unsubstantiated dig at the real Fix Kit? Is business this slow?


The Fix Kit from MTNTK (that uses the garbage wiseco piston) was around long before your product and has an excellent track record in both 800 CFI's yet you slam it every chance you get.

There are thousands of these kits out there. Polaris dealers all around North America have become distributors for this product. I wonder why that is?

Polaris feels so strongly about it that they are now recommending ALL 800 CFI get the FIX Kit in their engines.

What does that say? A company like Polaris recommending and endorsing an aftermarket kit be installed into eveyone of their engines INSTEAD of their pistons?

MTNTK let's their products speak for themselves. Never have they ripped RKT's piston yet Kelsey does it on a regular basis.

Grow up!

 

[RKT]

What experience do you have with wiseco piston's in the CFI 800 Polaris? And why the unneccesary and unsubstantiated dig at the real Fix Kit? Is business this slow?


The Fix Kit from MTNTK (that uses the garbage wiseco piston) was around long before your product and has an excellent track record in both 800 CFI's yet you slam it every chance you get.

There are thousands of these kits out there. Polaris dealers all around North America have become distributors for this product. I wonder why that is?

Polaris feels so strongly about it that they are now recommending ALL 800 CFI get the FIX Kit in their engines.

What does that say? A company like Polaris recommending and endorsing an aftermarket kit be installed into eveyone of their engines INSTEAD of their pistons?

MTNTK let's their products speak for themselves. Never have they ripped RKT's piston yet Kelsey does it on a regular basis.

Grow up!

Not sure where the rumor that Polaris is endorsing ANYBODY's kits or pistons is stemming from??... but it is completely false.. Polaris is not recommending aftermarket pistons be installed INSTEAD of theirs... Just keeping it factual..

As for the ,supposed, ripping on the the MTNTK kit.. There is no mention of that anywhere in this thread.. So, not seeing the connection there...

 

[Laundryboy]

I'm not privy to any correspondence from Polaris but it does seem a little suspicious that they would endorse anything other than their own product. That’s like saying we give up and you can produce this better than we can. I just don’t think that’s going to happen.

 

[Powderforlife907]

I am not saying Polaris is endorsing the FIX IT kit but the 2 local Polaris dealers around here have been recommending the kit.

 

[wellfed777]

WOW ! being right and being a DICK still just makes you a DICK
just saying

 

[tdorval]

He might have been remembering someone's post from a bit ago. Someone claimed polaris sent their dealer a letter stating use the mtn tek kit instead of OEM pistons. The guy couldn't find the letter though...

 

[backcountryislife]

The guy couldn't find the letter though...

Well that's hard to believe.


I've got it right... ok, hold on, nah guys, I REALLY did get a letter from a major MFG admitting that they suck at making engines & that people should install a kit from an aftermarket company to fix their F up that they've allowed to go on for years & years without fixing...

 

[diamonddave]

Not sure where the rumor that Polaris is endorsing ANYBODY's kits or pistons is stemming from??... but it is completely false.. Polaris is not recommending aftermarket pistons be installed INSTEAD of theirs... Just keeping it factual..

As for the ,supposed, ripping on the the MTNTK kit.. There is no mention of that anywhere in this thread.. So, not seeing the connection there...

Exactly what I figured you would say. Nobody is buying it though.

Okay....Based on that psychology, I can state the Wossener piston can't retain locating pins.

Do you have any pictures of these "wiseco pistons" that you have tested in the 800 CFI that are defective you could post for all of the readers?

Being that I recommend and install these, if there is a problem with them, I would like to see it. I don't want to continue recommending and installing these wiseco pistons if they are going to blow up, create 2 day recovery sled retractions, cause heartache, more money, and ruin my reputation.



As for my earlier statement:

There is no letter so if that's what you need to see to believe it then you'll be waiting a long time. Polaris isn't stupid. Someting like that would never be documented. Dealer's in the know, know the real truth.

 

[INDEEP]

Ain't no way Polaris HQ is saying a damn thing about the MTK Kit. There's no money in it for them. Saying they push that kit is saying two things:

1. They admit there's a problem

2. They (a billion dollar company) can't reproduce a piston that fits

The only reason many dealers recommend aftermarket top ends is because they have to face the pi$$ed off customer. Hell, maybe they even have a conscious. Ever try calling a Polaris customer service line? Good luck with getting any where with that. I actually feel bad for the good dealers.

 

[icecarver]

I wouldn't go so far as to say that dealers are endorsing, but I know for a fact that they are installing. Close friend of mine hatched a '10 and I watched the kit go in at the dealer.

 

[backcountryislife]

I wouldn't go so far as to say that dealers are endorsing, but I know for a fact that they are installing. Close friend of mine hatched a '10 and I watched the kit go in at the dealer.

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[indydan]

Big Bore

Hello everyone !! 95 degrees and HOT Here !! The heat made me stop in @ Snowest for a minute peak.

I am not a Big Fan of Big boring on of the 2008 to 2012 800 Motors.

I built a few Protype BB motors out of the off set bore 2013 Motor.

The thicker cylinder with the off set of the 13 motor allows for the possibility IMO building a dependable Big Bore.

These will be tested another season before I make the call on whether to produce a Big Bore for sale ( I am guessing at best a 20% chance of it making it to the snow for production. ).

It is built from Cast Pistons and I expect the pistons to hold up well but not sure if its worth it for the price.

The Long Rod runs so good Its hard for me to get my head around tampering with what really works.

Its like the 660 kits, lot of dough for the cc gain.


Time to go Snow Dance !!

Dan

 

[rydningen]

Good to hear you are having a warm summer, alot better than the 55'F weather we are having here in northern Norway!

Well, the reason I have been thinking about big boring the engine with the LR crank is simply because it makes sense that it would work well...atleast that is what iam thinking.

Is the only reason why you wont be running a BB because of the thinner walls if the stock monoblock gets bored? What do you mean about the 13 engine has an offset?

Would you be willing to share some more on your prototype BB, how many CC?

 

[Norway]

The Long Rod runs so good Its hard for me to get my head around tampering with what really works.

Heard that from Tony, the itch is there..


Time to go Snow Dance !!

Dan

Yeah, midsummers eve has passed. Time to ramp up that dance and get them snowflakes flying early!

 

[indydan]

Good to hear you are having a warm summer, alot better than the 55'F weather we are having here in northern Norway!

Well, the reason I have been thinking about big boring the engine with the LR crank is simply because it makes sense that it would work well...atleast that is what iam thinking.

Is the only reason why you wont be running a BB because of the thinner walls if the stock monoblock gets bored? What do you mean about the 13 engine has an offset?

Would you be willing to share some more on your prototype BB, how many CC?

I understand what your saying.

The 2013 has an off-set upper case half & cylinder the allow more room to allow for the rear cylinder extension to be about .050 thou thicker.

As for the Big Bore, the protype's are built from home made pistons that I casted from melted down OEM Polaris Pistons & ( salt & pepper additive ) so I could put the wrist pin where I wanted it be and to get the size I wanted.

Time will tell.

 

[wfieldin]

Keep Dancing

Snow is coming!