Snowmobile World banner

1 - 14 of 14 Posts

·
Registered
Joined
·
292 Posts
Discussion Starter #1
If any of you are interested I will be dynoing a 2000 mxz 700 this
    weekend with the RK TEK head. I will be searching for the
    correct jetting combo, as many are aware I was the one who did
    the testing on the 800 with Kelsey present as well. I will not be
    releasing the peak power numbers but will have jetting specs
    after the runs. I hope to complete them by sunday. This testing is
    very expensive and is tough on my own machine. Not looking to
    make a fortune off of it but would like to offset some expenses.
    Is there an interest?? Let me know. Just for info I wore out 2 sets
    of pistons and rings on the last test (800 RK TEK HEAD), that
    was my personal sled as well. I am now waiting for my crank to
    let go.LOL I will also be trying to test with the flat slides for the
    people with 2001's.
   

    GLHRACING
 

·
Registered
Joined
·
184 Posts
WOW

IT SEEMS TO ME THAT THE COMPANY THAT IS MAKEING
THE HEAD SHOULD BE PAYING YOU FOR THE RESEARCH.

I know some one will disagree but if I spent the money on ther producrt
I would expect them to know the jetting specs.

The more I heare about the rk tek company
The more I belive it would be a bad
investment  to buy ther products.  

this is only my opinion and every one else is entitled to thers  so
please dont resort to calling me names because you dont like my opinion.
 

·
Registered
Joined
·
279 Posts
Two sets of pistons and rings? How many pulls did you make. I realize were not talking apples to apples but We use a small block chevy as a test mule for some circle track mods and we must have 60 runs on it and leak down is still fine.
 

·
Registered
Joined
·
292 Posts
Discussion Starter #4
tb2,

I presume from your posts you are an educated engine person.  I also presume you understand that durring development of an engine configuration one must establish extreems.  I did this in hopes that it would eliminate some problems encountered by other customers.  I had the abbility to change out parts if needed.  They would have been fine for trail usage but under the demanding strains of a dyno pull I chose to change them out.  I spent four years dynoing engines at college on a 350 chevy as well and know fully how long the engine will last before it needs rebuilding.  However when testing a 2-stroke/cycle for peak performance with a particular item extreemes must be found.  We had no burn downs but took the MOLY off the rings twice and had excessive piston slop.  My engine has had over 350 dyno pulls on top of 6200 miles and over 500 grass runs.  Somethings are just bound to happen.

GLHRACING
 

·
Registered
Joined
·
417 Posts
GLHRACING; I was pulling a 00 700 a couple of weeks ago and lost a set of rings. Wash was mint as were the plugs and EGT,s. I was suprised that this happened. I've never seen it before. The bores and pistons were fine. What is the cause?


BTW it was shimmed and cut, Dyno port pipe and can, bored carbs and V-force.
 

·
Registered
Joined
·
292 Posts
Discussion Starter #6
Krusty,

It is my belief that when these series 3 engines are jetted to what would be considered dangerous but safe,  the rings see to much heat.  We often loose them when tuning twin pipes and and setting up for grass.  On one particular 700 we lost 3 sets in one day, jetted up one size and never lost another set.  I would be interested in comparing notes with you on that engine.  I have one with some odd-ball stuff done to it, but stock pipe.

GLHRACING
 

·
Registered
Joined
·
103 Posts
I have these on two of my sleds, a 2000 600 and 700. The 600 is stock and with only the addition of the head it pulls right through the stock clutching. This is without doing any rejetting. The wash was fat before adding the head so I know I have some jetting work to do. We have no snow so I SOL for now. I'm starting with two sizes smaller and installing a 53-47 helix in place of the stock 50 to test when (IF!!&#33
we ever get any more snow. The 700 is modified so that jetting information is irrelivent. We are supposed to go to Quebec this weekend and we'll be running a Spedwerx 800, a tweeked FZ 700 my 6 and 7. We'll report results if we get to go.
Ronzx9
 

·
Registered
Joined
·
417 Posts
GLH;Started at 330 mains(this is what the customer was running) all other jetting stock. This was also before the reeds were installed. 124 hp. To make a long story short we ended up at 290 mains with reeds making 135 hp. This was Saturday at -3 degrees C. Monday made one pull at 138 and lost it. It was about -10 degrees C. This must have been the difference. To look at it, it seemed safe but apparently not. Have since removed shim and ported cylinders, cut a Hemi head and get 130 hot and sustained. Don't think the Dyno port stuff would last to long on the lake.
 

·
Registered
Joined
·
279 Posts
GLH you must have one heck of a notebook put together from all that testing. I apperciate all your input.
 

·
Registered
Joined
·
103 Posts
tb2, They put 14 hours of dyno testing on my 700. I think you already know who did the motor work. If we get any more snow we should all hook up for a ride!

Damon is one heck of a guy. I certainly appreciate all of his help! ronzx9.
 

·
Registered
Joined
·
292 Posts
Discussion Starter #11
Krusty,

With bored carbs we were using 380 mains for about 25 deg f.  with the stock pipe we are pulling about 133hp at 7800, you could hold that baby open for miles that way.  Those 700's are an awsome engine.

tb2,

My note books are pretty thick just from this winter.  Hope it gets thicker, that's why I love this sport.  I herd you 700 runs pretty well IE (tt670).  I am not to far from you, would love to hook up for a ride.

GLHRACING
 

·
Registered
Joined
·
279 Posts
zx9,glh I would love to hook up sometime, Always looking for new ridingbuds and new spots. It looks like we may be riding again tomorrow if the weather holds. GLH the motor runs pretty good considdering I dont have that much done to it.
 

·
Registered
Joined
·
49 Posts
GLH- you spent a weekend on the dyno- searching for correct jetting???

Just asking, because I hope to be running a 583 on a flow master this spring, and I know dyno time ain't cheap.
 

·
Registered
Joined
·
1,177 Posts
Damon, I am very interested in the dyno of the 00 700 with the RKT head.   I have talked to Kelsey about ordering one for myself.  I had other problems with pistons and rings, and spent my hard earned cash on those.  I have also talked with ronzx9 comparing our 700's last year.  Thanks for doing this for all of us, as we all know how expensive dyno runs are.  Not to mention your valuable time.   Thanks in advance, Dave.
 
1 - 14 of 14 Posts
Top