is 2000.00 not that much?? Add a crankshaft,crankcase porting, and crankseals. I know most people are not going to keep their old crankshaft in there to ruin their investment. Then you have to do something about your carbs. You cant expect a big motor to use stock or slightly warmed over 38's If you do you have to be giving up power. You should be able to use all the power you paid for by going to such a big engine.
GROUP K 845cc SuperJet Freestyle Tech Info
- Thread starter SUPERJET-113
- Start date
- Location
- San Antonio
Compare a 300-400$ hot rods to a 1000$ + brand new stroker crank to make these kind of ccs on a normal motor... Most that want this top end probably have the proper base set up. I would bolt this on mine in a heart beat if given the opportunity. Seems most big motors are already running dual 44's I dont doubt this motor if you had nothing would cost 3-4k but if you already had a good bottom end, I looked at what I would cost for me to bolt it on to mine and it would run about 2000 (not counting the money I have invested into my ported cases, crank, carbs,
I wonder how a stock stroke 85.5 mm normal big bore sleeve and ported 61X cylinder with big reed cages aftermarket 44 carbs and a slightly lower pitched impeller than what you would use on the 845 would compare to the 845 with the modified 38's. I dont think there would be a huge diff. I went to the site and if you factor in getting the cylinder and head you dont have and if you do need a crank then it is much much more. My point is is it better to invest on a conventional big bore and use regular off the shelf pistons costing a lot less and gain acceleration via better breathing.
If you have over 3 grand to spend then you might as well go with a stroker and a conventional 84 or 85.5 mm big bore with a 4,5,or 6 mill stroke. the cc should only be slightly less and the increased torque with longer stroke should be a gain over the few cc's of the 845.
If you have over 3 grand to spend then you might as well go with a stroker and a conventional 84 or 85.5 mm big bore with a 4,5,or 6 mill stroke. the cc should only be slightly less and the increased torque with longer stroke should be a gain over the few cc's of the 845.
waxhead
wannabe backflipper
- Location
- gold coast
A set of modifed stock 38s will cause you to comit suicide
They end up with a massive lean spot in the transistion , maybe if you buy a set of seadoo 38s it wont happen as thery are a different casting
If your going to buildl an engine like this your going to want 46,s at least
They end up with a massive lean spot in the transistion , maybe if you buy a set of seadoo 38s it wont happen as thery are a different casting
If your going to buildl an engine like this your going to want 46,s at least
waxhead
wannabe backflipper
- Location
- gold coast
Has anyone considered that when you go un in capcity on a two stroke
that you open the exhaust port on even a mild engine at 180 degrees
So what ever you got divide by 2 because your not using half that new capcity you just paid heaps for
I think you will find that about 1 in 10 wiseco pistons dont collapse the sleeves
Most people dont know because who pulls there motor apart to check unless your a racer
I got warranty on 4 sets of wiseco pistons because of this, the sher fact that these engines run wisecos is enough to put me off buying them
Be glad you have a few overbores you will need them as the collapsed wiseco goes up the bore sideways and wears the top of your exhaust port out
that you open the exhaust port on even a mild engine at 180 degrees
So what ever you got divide by 2 because your not using half that new capcity you just paid heaps for
I think you will find that about 1 in 10 wiseco pistons dont collapse the sleeves
Most people dont know because who pulls there motor apart to check unless your a racer
I got warranty on 4 sets of wiseco pistons because of this, the sher fact that these engines run wisecos is enough to put me off buying them
Be glad you have a few overbores you will need them as the collapsed wiseco goes up the bore sideways and wears the top of your exhaust port out
the WaTeRhAwK
fryin' up a/m electrics..
- Location
- okc
jared, what do you mean by it collapses?
waxhead
wannabe backflipper
- Location
- gold coast
The skirt collapses so the piston can rock in the bore
The worst we had was a 12thou collapse this will make for massive wear
The worst we had was a 12thou collapse this will make for massive wear
the WaTeRhAwK
fryin' up a/m electrics..
- Location
- okc
by collapse you mean bending inward towards the rod?
waxhead
wannabe backflipper
- Location
- gold coast
yes
it allows the piston to then rock in the bore
it allows the piston to then rock in the bore
the WaTeRhAwK
fryin' up a/m electrics..
- Location
- okc
what causes it? weak casting? I guess that would be a good reason for billet pistons.
waxhead
wannabe backflipper
- Location
- gold coast
Im not sure
I just know that wiseco know about it and they cant fix it
If you winge they give you warranty
I just know that wiseco know about it and they cant fix it
If you winge they give you warranty
the WaTeRhAwK
fryin' up a/m electrics..
- Location
- okc
seems like they could just make the skirts thicker.
with as much hp as these engines are making now, it doesn't seem like the extra weight in material to make them stronger and less prone to doing that would be an issue.
with as much hp as these engines are making now, it doesn't seem like the extra weight in material to make them stronger and less prone to doing that would be an issue.
scottie mac
X-
I think rod angle has a lot to do with the wearing out of the cylinder walls and piston skirts. The shorter the rod, the worse the rod angle is. We don't have much issue with our 8mms strokers with cylinder wear and skirt collapse, even running long, wide open 7800 + rpm races.
Jarred, did you have this issue with your 8mil? Or was it in stock and short stroker set ups?
Scottie
Jarred, did you have this issue with your 8mil? Or was it in stock and short stroker set ups?
Scottie
waxhead
wannabe backflipper
- Location
- gold coast
It was on a stock stroke
As brad dawson about the new ones( scottie know who i am talking about)
he just had a set do it last week
The piston collapsed and was tightening the squish on one side causing a misfire
Sure if you are running a big squish then it wouldnt be an issue
butif you were running a big squish then your not building a fast engine
he went back to dome prox pistons
Like i said i wouldnt touch wiseco
As brad dawson about the new ones( scottie know who i am talking about)
he just had a set do it last week
The piston collapsed and was tightening the squish on one side causing a misfire
Sure if you are running a big squish then it wouldnt be an issue
butif you were running a big squish then your not building a fast engine
he went back to dome prox pistons
Like i said i wouldnt touch wiseco
waxhead
wannabe backflipper
- Location
- gold coast
What are you basing that on
the new ones are worse than the old ones
actually most 5mm cranks still run the stock rods
the WaTeRhAwK
fryin' up a/m electrics..
- Location
- okc
waxhead
wannabe backflipper
- Location
- gold coast
pro-x
the WaTeRhAwK
fryin' up a/m electrics..
- Location
- okc
aren't the pro-x pistons drop-forged and casted in the same way and made with the same material as wisecos?
