Other PHP 937 or DASA 970?

[SmittySX]

Well im almost ready to pull the trigger on a new engine for my bob g2. Looking to uprade to either the DASA 970 10 mill ( aka 1000cc) or to the Power House Performance 937 4 mill. The dasa is just a little bit more money,is it worth it? Or is there a better bang for the buck i dont know about?
What im looking for is arm yanking power and reliability. Any pros, cons, or any info to help would be greatly appreciated.

 

[chadman154]

I have never ridden a dasa motor, but i love my 4 mil 916 PHP. Pm jace forest, onlyFX-1 scrren name. He has a PHP 898 and has ridden some other motors as well. Zack at PHP does all my building and tuning. My stuff runs great. It is sometimes hard to find good customer service these days.

 

[DAG]

A tuned 10m will always out preform a tuned 4m, the answer is a no brainier

 

[customride0105]

Ive got a Tim judge ported freestyle dasa motor it's a 5 m&m stroker dasa cast 7 port cylinder flatwater flip able less than 10 gallon of gas threw it.. I'm getting ready to sell I can tell yeah a lot cheaper than any the motors ur looking at

crank was rebuilt cylinder was new cases new porting new new top end all work done by tj for freestyle 3500 shipped

 

[Proformance1]

Buy what you want and can afford and never look back. I have the 971 DASA and really like it, although I hear great things about PHP

 

[waterfreak]

my 970 dasa I had last year in my yellow vision hit like a freight train!!
Like Dag said, you can't compare a 10mm to a 4mm
BTW , you can get their new 1100 (same 10mm crank +94mm pistons) for the same price

 

[FearMyWrX]

Your going to get a lot more ride time (smaller service internals) from a 4mil in comparison to a 10 mil. So there is also a trade off you have to take into consideration.

10 mil is going to have more power, 4 mil is going to be more reliable and may last longer.

 

[SmittySX]

Thanks guys. As far as reliability goes with a 10 mill, what would its " routine maintenance" require..?

 

[Matt_E]

More frequent inspection I would say. I ran 250 gallons through my 10mm last season and the crank is still like new. The bores also look new.
I am replacing the pistons (and honing the bores) only because the old pistons had some water intrusion scoring under the rings and I am going to race gas compression.

 

[chadman154]

A tuned 10m will always out preform a tuned 4m, the answer is a no brainier

I am confused by your statement, You state a 10mm is better than a 4mm.
Comparing a 12mm to a 10mm. For example there was threads about the xscream 12mm 1000 not hitting as hard as the xscream 10mm 1000.
That would disprove your theory that bigger is always better....
I am just trying to understand your theory in your statement.

 

[Matt_E]

I am confused by your statement, You state a 10mm is better than a 4mm.
Comparing a 12mm to a 10mm. For example there was threads about the xscream 12mm 1000 not hitting as hard as the xscream 10mm 1000.
That would disprove your theory that bigger is always better....
I am just trying to understand your theory in your statement.

All other things being equal, a longer stroke will produce more torque which means more power. There's nothing magic to that, it's just physics.
However, it's rare that "all other things are equal". Crank weight might be different. Porting might be different.
I guess a blanket statement that bigger is always better isn't quite correct.
But it's a pretty good bet that a 10mm stroker is going to be better than a 4mm stroker, at least if the builder was half competent.

 

[SmittySX]

So tearing apart the motor at the end of the season is a must.. After how many hours would you say tear it apart after riding 2-3 days a week in the summer? Sorry, im new to strokers and dont know poop about em! I need all the info i can get, even if its stating the obvious.

Thanks guys.

 

[KTM434]

Your going to get a lot more ride time (smaller service internals) from a 4mil in comparison to a 10 mil. So there is also a trade off you have to take into consideration.

10 mil is going to have more power, 4 mil is going to be more reliable and may last longer.

I agree but there are other factors as well with a larger stroke. Normally 4mil strokers use OEM cranks and stock rods to save build costs. A 10mm stroker engine will use a billet crank and long rods so they are more comparable than you'd think. There is less side loading with the long rods which decreases friction and loads on pistons, cylinder walls, and rod bearings but you can't change the fact that a longer stroke increases piston speed at any given RPM.
It is although a general rule of thumb that the shorter the stroke the longer the service intervals but there are too many factors... Even the same cylinder with 2 different engine builders will have different port sizes and shapes which will also affect service life and performance. Dasa has a great reputation but I've also heard great things about Zack and the PHP billet engines as well. Buy the one that you feel most comfortable with because there are pros and cons to both.

 

[Billybo455]

you guys seem to forget who's setting them up has the biggest role in how the motor runs and the ski performs.

 

[Matt_E]

True. I'd rather have 4mm set up by Jetworks than a 10mm set up by GroupK

 

[chadman154]

So tearing apart the motor at the end of the season is a must.. After how many hours would you say tear it apart after riding 2-3 days a week in the summer? Sorry, im new to strokers and dont know poop about em! I need all the info i can get, even if its stating the obvious.

Thanks guys.

My motor was new this season riding about 2-3 days per week. I will be tearing mine down the end of next season. I go by the advice of my builder.

 

[Billybo455]

now here is another important question. how do you know if you can trust your builder?

 

[Tommygunz]

Give our shop a call and we can point you in the right direction! My 4 mil 898 ran like an animal all year-2 to 5 rides per week and ridden hard for testing purposes. Just tore down and it looks like the day we built it. Even took it over to Millennium technologies to have it spec checked and by their standards as well no wear! We will do all we can to get you on a quality motor.....and we are in the process of having our lightweight cranks built as we speak ....

 

[Billybo455]

people always trying to sell stuff. that's what makes it hard to trust stuff people. lucas's dasa 900 10 mil stroker went about 2 years and almost 600 gallons of fuel. never inspected or anything. bore was still great on it.

motors are like playing a better lottery system. some blow up in 5 minutes. others last years. happens with every builder. i can't even tell you to ride both motors to compare anymore. lucas's 900 was the nastiest 900 i've ever personally been on. people use to think it was over a 1000cc's. i wish zach had more time on his motor when i got to feel it.

 

[102nd7]

You might want to check out nucklear6 I know he was selling a very cost friendly Dasa based motor for around the same price as the php937. That's who I was planning on buying my motor from until I read a few threads from people who bought the Php 937. Which persuaded me to buy from PowerHouse.