701 porting

wsuwrhr

wsuwrhr

Purveyor of the Biggest Brapp
Location
Alta Loma, working in Upland
Have you contacted Kyle at DASA about your issues?

I would be able to help you as well.

Brian

Cranes said:
Thanks mate your motors are very high on our shopping list I talk to Craig way to much ha ha I also have another motor issue that we are trying to sort out at the moment it's a brand new billet dasa 5mm 85mm piston power valve motor the motor has some weird mesurments we are trying to sort out hope fully dasa will get back to Craig soon so I'll leave it at that now till I here but if any one has built a dasa 5mm 85mm piston motor motor I would love to talk to u about deck heights and so on we have 2 brand new rickters with brand new every thing that run like crap the stroker is worse then the 701 for bottom end power
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kevbo

kevbo

Location
dfw
Grant359 said:
OK, to add a little more clarity to this thread it is my motor. It was built by Steve Cunningham (aka Carbon Blaster aka InfusionT). The purpose of this thread is that I have a motor that does not run very well (no throttle response). I've had another engine builder tell me that the porting is far too aggressive for what I want a motor for (it is going in a rickter for surf riding), As you can imagine, I am in the middle of one word against another. It is petty that it has come to this but it has been a long journey and I need an impartial opinion. The numbers are as Cranes has said. Another thing is that Steve built the motor with 35cc domes which produced a little over 150psi comp. (which he adamantly claimed was enough) I changed the domes to 33's which boosted the comp to just under 170psi. The comp just seems too low? Is there anything in the numbers listed that would explain the low comp? Yes, we even bought a new comp gauge just to check....
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You have a high port cylinder, it will make a lot of power/thrust. Use a limited pipe and a short prop, then the lag will diminish greatly. It should be fine if you can get use to a smooth throttle. If you must fan the throttle then you are in a hopeless situation that can only be cured by spending lots of money. Im simply amazed that there is so much attention given to engines and carbs with no thought of what the correct load should be.
 
Grant359

Grant359

Location
Sydney Australia
kevbo said:
You have a high port cylinder, it will make a lot of power/thrust. Use a limited pipe and a short prop, then the lag will diminish greatly. It should be fine if you can get use to a smooth throttle. If you must fan the throttle then you are in a hopeless situation that can only be cured by spending lots of money. Im simply amazed that there is so much attention given to engines and carbs with no thought of what the correct load should be.
Click to expand...

Before Steve started to port my motor I said that outright power was not as important as smooth lineal power and off idle response. So this thread is just as much about did I get what I asked for.

As for band aid solutions, for the cost of a new prop I can buy a new cylinder and be on my way to starting over again. Why would I try to prop what most people are calling a race ported motor when I can prop a "freeride" ported motor for the riding I do. Steve knew what prop, hull, type of riding etc etc before he started.

As I said, it is petty that this is debated in a public forum, but Steve refuses to listen to my concerns. He simply states that he does not give a s**t about what any other engine builder thinks, he believes he has given me what I have asked for and "if god believes that he has not done a good job then god will be his judge, not me the customer". Religious or not, hiding behind god as being your judge and refusing to face commercial realities is plain weak!
 
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SUPERTUNE

SUPERTUNE

Race Gas Rules
Location
Clearwater Fl.
We mostly build for the Freestyle/Freeride industry now, but have custom built lots of racing engines in the Pro modified racing classes before the Superstock rules came out.
With this in mind...with these spec's you posted is for a stock 68mm stroke. Just doing a quick check for what the calculator that wax posted would fit the guidelines of a pro race engine or high rpm Superstock engine.
As per your post give or take on the -.3mm deck height.
Transfer at 52.2 mm figures about 115* crank degrees and about 130 degrees of duration.
Exhaust at 34.5mm figures about 81* crank degrees and about 198 degrees duration.

Like Kevbo said pump and total engine setup play a big picture how an engine can respond to load.

Here is the outline for an engine with these port mapping.
-------------------------------------------------------------------
Use a programmable racing ignition, race gas compression ratio, small 140mm mag pump with a small pitched impeller, race carbs, and more needy of a dry pipe and NOT a wet pipe as the port mapping needs the rpm to make it work.

This is my opinion only so use your own judgment.
I'm not here to point fingers, just genuinely trying to be helpful for the Freestyle/Freeride industry as a whole.
 
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Grant359

Grant359

Location
Sydney Australia
Chuck, thank you again. Your advice is enormously appreciated.

A quick update, I have decided to buy another stock cylinder and have wax port it to the specifications that I originally wanted. I made thus decision last nght and posted both cylinders to wax this morning.

As I said, this has been a long journey to this point and Steve (infusionT) has had many opportunities to resolve this simply and amacably.

After being made aware of this thread steve called me today and said that if I supplied z new cylinder he would port it, but flatley refused to pay for a new one even though my original one I said he can keep. Put simply, I don't accept that as a resolution as steve still denies that these porting specs are not suitable for freeriding.

Steve openly stated this this thread proves nothing as everyone that has posted so far "is simply a lunchtime legend in their own mind".

.... Try not to take it personally guys. Steve doesn't have the best communication skills....

I will end up with the motor I originally wanted, it will just take more money. Thanks steve.
 
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wsuwrhr

wsuwrhr

Purveyor of the Biggest Brapp
Location
Alta Loma, working in Upland
If you would like, would you to send the complete cylinder to DASA?
We will make it right and send it back to you.

Get back to me and let me know if this is acceptable to you.

Brian


Cranes said:
Thanks mate your motors are very high on our shopping list I talk to Craig way to much ha ha I also have another motor issue that we are trying to sort out at the moment it's a brand new billet dasa 5mm 85mm piston power valve motor the motor has some weird mesurments we are trying to sort out hope fully dasa will get back to Craig soon so I'll leave it at that now till I here but if any one has built a dasa 5mm 85mm piston motor motor I would love to talk to u about deck heights and so on we have 2 brand new rickters with brand new every thing that run like crap the stroker is worse then the 701 for bottom end power
Click to expand...
 
C

Cranes

Location
Penrith
guys i replyd to brian sounds awesome my aus contact will talk to himfor sure i pmed brian some more info man if my dasa goes like it looks ill be super happy man its hot wax is our new engine builder and scooter builder ha ha
 
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