Help me decide: P5 or WS7II

[coloradoNitro]

Hey there, I have a Ofna PBS and am looking to get a new motor for it. I don't officially race, no 1/8th scale racing where live:eyepatch: So me and buddies run at the local BMX track. Anyways I am a motor freak, and want either the Nova/Rex P5, or the RB WS7II. I know they are both great motors, just looking for some input beings I can't see them in action. Any input will be appreciated.

 

[FlyinRazorback]

I had a P5 and it is a monster. Lots of bottom end, and after about 1-2 gallons the top end comes alive. The only bad thing I am hearing about this engine is that alot of people are having rear bearing failure, but I'm sure it is something that NR will address. As far as the WS72 goes, I have seen it in action, and it rips. The original WS7 is a little weak on the bottom, but this one comes out of the hole alot harder. I would say it has the bottom end of a P5 or V01b. But it is still just as strong on the top end as the first WS7. Not sure if I can justify spending $325 for the RB, but if you have the $$$, then go for it.

 

[coloradoNitro]

Thanks Razorback! Thats the kind of stuff I need to know. Anyone else. Also hows the powerband between the two? I hear the P5s pretty smooth, and the WS7II can be alittle peaky.

 

[HumboldtBlazer]

Are you stuck on just those 2, or is there room for another brand/model suggestion?

 

[coloradoNitro]

Always open to suggestions. What you got humbold?

 

[FlyinRazorback]

To me, the P5's powerband wasn't real smooth, at least not as smooth as my V01b.

 

[HumboldtBlazer]

The Sirio 7 port AAC buggy race engine is the shiznit in my opinion. The engine has SO much low end and is great for most American style tracks (moto cross or BMX type). The engine is very reliable, and big names in racing are switching to this new engine. Yucchi Kani being the first that comes to mind racing this engine in the current season. It flys me over the compitition. When I raced at my local track witht hat engine everyone was like:OMG: 8-0

 

[coloradoNitro]

Yeah I read about that one in RCCA. I have a Sirio in my tmaxx. Hows the AAC p/s holding up? I haven't heard anything on how many gallons guys are getting though them.

 

[HumboldtBlazer]

p/s? It is not a pullstart but then engine is holding up very well and seems to get faster and faster, heh maybe I'll take the restrictor out someday.

 

[coloradoNitro]

by p/s I mean piston and sleeve.

 

[HumboldtBlazer]

yess the AAC piston and sleeve are suposed to be better than ABC, but only time will tell.

 

[RobH]

Our local track pro runs the P5. We have a small track tight turns (85 foot straight away). Bottom end if king on our track and the p5 obviously delivers.

I highly suggest that you think about how you're going to use it. You said you're running on a BMX track (just bashing I'd guess?). Those BMX tracks are huge compared to a buggy track. You're gonna have a lot of distance to build up speed. Buying a bottom ene engine seems kind of silly. Why not go with the RB Concepts C4 or C5? Those are nice engines from a great company but they are just built for speed. I've also heard swapping to a 12 tooth clutch bell bring the bottom end out of the C5 too.

Good luck,
Rob

 

[coloradoNitro]

RobH, thanks for the input. We don't use the entire BMX track, there'd be no way to have a line of site. We us a little section that gives us a tabletop, a smaller set of triples, and a BIG double. the longest straight is maybe 80ft. Does the P5 have a respectable top end? I would just like something smooth, probably the main reason that I'm leaning towards the P5 vsWS7II. My first buggy was a Mugen Athlete and I got a Paris Rex three port. I loved that motor.

 

[RobH]

I have no personal experience with P5. I just know that the guy at my track that wins all the races uses it. LOL

 

[FlyinRazorback]

If you want something smooth the OS RZ-V01b and VZB have the most linear powerband you will find. They are also very easy to tune.

 

[militarymaxx]

Razor - would you recommend slappin' a OS RZ-V01b and VZB into a Storm as a replacement for the stocker ? I'm looking for reliability and good tuning characteristics.

 

[FlyinRazorback]

I would swap it out in a heartbeat......

 

[coloradoNitro]

thanks for the input guys, just one of those deals where I'll probably want the one Ididn't buy.

 

[RobH]

Originally posted by FlyinRazorback
If you want something smooth the OS RZ-V01b and VZB have the most linear powerband you will find. They are also very easy to tune.

I don't mean to stomp on your toes or start an arguement, but what do you say about this:

i was so pleased with the performance and the life i got from my
c4.....thats why i purchased the c5............i thought about getting
an os,,,,but the majority of people i talked to said the same
thing.....that they are excellent engines and tune easy but wont last
as long as a novarosssi based engine...........and i just dont have
the money to keep buying engines all the time......is this fact???i
dont know, but like i said....i was so pleased with my c4, i figured i
would stick with them........

this guy isn't the sharpest tool in the shed. our track is tight and the top end on that C5 doens't do him a lot of good. he races pretty good so i'm guessing he knows something anyway.

do OS engines wear out fast? he's refering to a rebuild. someone just said that a p/s for a OSV01b is only $85 on ebay anyway.

how many gallons before you have to rebuild?

-Rob

 

[FlyinRazorback]

Depends on how you treat them. Some guys get upwards of 6-8 gallons on them before rebuild and some get 3-4 gallons. I am on my second OS engine now. I sold my first one with 3 gallons on it and it was running great. I will be the first to say that the majority of the NR based engines WILL last longer than the majority of the OS engines. Maybe with OS's longtime popularity and widespread availability, not to mention it is usually cheaper than the others, you have more newbies buying these engines and wearing them out. I dunno. :shrug: