Freestyle How powerful is a big engine?

Guigs

Guigs

Location
Montreal, QC, Canada
You have a good watenut. I totally agree that numbers are not everything. What is best top end kit to use with a 6mm stroker? I know Xscream and Ada are don't have anything for 6mm, they only offer 5 or 8mm cylinder kit. So I was thinking about the 89mm Dasa kit. I've heard There's a way to fit a 5mm Ada cylinder with a 6mm crank, Is it a reliable setup? What are the other options?
 
kevbo

kevbo

Location
dfw
Guigs said:
It's totally true there's a lot of other parts that can modified performance. I just wanted an average. Is it more like 100hp or 150hp??
Maybe you could tell who are the best engine builder with comments on engines they have build.
Click to expand...

More like 100HP. It takes a custom/dry pipe and a lot of rpm to get big HP numbers. Low port/B-piped engines respond fine but are limited on peak HP.
 
Last edited:
Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
Guigs said:
You have a good watenut. I totally agree that numbers are not everything. What is best top end kit to use with a 6mm stroker? I know Xscream and Ada are don't have anything for 6mm, they only offer 5 or 8mm cylinder kit. So I was thinking about the 89mm Dasa kit. I've heard There's a way to fit a 5mm Ada cylinder with a 6mm crank, Is it a reliable setup? What are the other options?
Click to expand...

This is something you should be discussing with your chosen builder.
 
Aircraftsalz

Aircraftsalz

Thrust built Dasa Power
Location
Off site
I ran a Xscream 6mil motor, ADA cylinder, Dual XS46's, avgas, MSD tl & it ripped... Very smooth power, great brap.. I'm sure Junkyardj will answer any questions, but I rode that ski a lot before I sold it to JC.... He's in love with that motor setup

IMO I like a motor with PV's for a little more snap...

And Dry pipes rock!!! That new Powerfactor with the new waterbox, sounds like a b pipe, no more water back flow problems
 
Waternut

Waternut

Customizing addict
Location
Macon, GA
Most engine builders in this business are in business because they love the sport. Paul Lehr, jetworks, and xscream are all very knowledgeable and will be happy to answer any questions you have. If you aren't sure about what direction you really want, just give them an idea of what you want to do and they'll try to find the engine that will best suit your needs and your budget. Most are very willing to help you out with an engine they didn't build either so listen to what they have to say and don't get offended if they correct you on something you believe is true.
 
Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
Waternut said:
Most engine builders in this business are in business because they love the sport. Paul Lehr, jetworks, and xscream are all very knowledgeable and will be happy to answer any questions you have. If you aren't sure about what direction you really want, just give them an idea of what you want to do and they'll try to find the engine that will best suit your needs and your budget. Most are very willing to help you out with an engine they didn't build either so listen to what they have to say and don't get offended if they correct you on something you believe is true.
Click to expand...

Well said.
 
Polish jet pilot

Polish jet pilot

4aces4aces4aces4aces4aces
Location
Warsaw, Poland
and BTW stock SJ is 73 hp. Keep in mind that adding kust bolt ons, eg. pipe will not work like 73 + 20 + something. If you match the manifold poorly you will get no more than e.g 12-15 hp out of the pipe, etc. Also amount and place of water injection will play a role and so many other factors.
 
masterblaster

masterblaster

X-H2
#s do mean alot guys,they are just down played here,hardly ever does anyone take the time to dyno a ski motor,and if they do they dont post the #s for the sake of a argument. Revs are important but once a good power band is achieved on a dyno with a strong # you can pump and prop that setup to get on the revs quick and hit as low as you would like it.
 
W

waxhead

wannabe backflipper
Location
gold coast
I see alot of guys on here that confuse hp with throttle response.
if you want big power then you need big port timings and they will have massive low end just you will have to grab alot of throttle to get it. They dont respond to smaller throttle inputs but when they come on they hit very hard. These are the engines they tell you to bore the nozzle on to make them go. its trying to over come the lack of throttle response and to bring it into the power band sooner
A lower port engine is more responsive to throttle input and so when you ride it the ski feels quick because it will jump every time you move the throttle.
This is how I set up the engines I build. Its much more fun to ride in the surf.
 
WILKEY

WILKEY

SO FAR CHANGE SUCKS!!!!!!
Location
Va Beach."from the WOODZ not the damn hoodZ"
i can give you just a little advise. if you have a regular motor, dont go to big. there is no way in hell i would go from a big bore to a 1000cc xscream motor. it WILL SERIOUSLY RIP YOUR ARMS OFF!!!!!!!!! and the boys that do ride the 1000cc motor got mad respect from me!!!!!!!!!!!!!!!!!!!!!!!!!
 
masterblaster

masterblaster

X-H2
yes sir those big 1000s do hit like a ton of bricks at WOT,deff takes some practice to learn to use that power. lower port timing helps to smooth the power band,but pvs, carbs,ign timing,comp,squish,pipe setup all play a huge role in making that happen,this is where id love to have a dyno to do some work on my setups
 
Last edited:
You must log in or register to reply here.
Top Bottom