moby doppler pipe clarity

so, i've searched and searched some more, but i wanna be clear on this: i won't get shit out of a doppler pipe, less'n i kit my AV7, right? even if i port and upcarb and such?

i gotta remember to ask shit _before_ i buy things...

Re: moby doppler pipe clarity

Doppler ER1 pipe will do nothing on a stock or lightly modified stock cylinder. I've never heard of people running them with any luck on any av7 motor. The G3 has an earlier hitting power band and agrees better with the slower reving av7 motors. I tried running my doppler on a 62 malossi kit and it preformed worse then with the stock exhaust on.

Leave the Doppler exhaust for the av10 70cc kits.

Re: moby doppler pipe clarity

or nice 50cc kits...

Re: moby doppler pipe clarity

A few other pipes will work best with the 50cc kits like the G2, Conti and Giannelli pipes. Well, those pipes just love high rpm's not matter what, time your 70cc or 50cc kits ports for massive rpm's and you are out of the power band of the doppler, restricting top end speed, but still have a massive mid-range boost.

Re: moby doppler pipe clarity

have any of you run the doppler on a av7 70cc parmakit?

Re: moby doppler pipe clarity

My doppler ran fucking awesome with a 50cc kit. I'm shocked that it wouldn't go well with a malossi 63cc kit. Maybe you didn't have it tuned it right? Or maybe you needed a peformance variator?

Re: moby doppler pipe clarity

yeah, I agree with Bret on this one the 50cc kit and doppler pulls out past 12000 rpm as indicated on my tach. The tach doesn't go higher then that so it ends up just pegging it out. The kit pretty easily pulls the bike past 55 mph with 11 x 56 gearing. I haven't GPS'ed it yet. RPM's at which the pipe pulls at is dependent on the cylinder exhaust timing anyways.

-naz

Re: moby doppler pipe clarity

thanks, yall. that's what i gathered...

on to the buy/sell forum now...

Re: moby doppler pipe clarity

Naz, I'm not to familiar with the pug pipes out there but did you try the kit with any other pipe? I wonder how it would compare!

I'm talking from a moby stand point here, as that's all I know. Also I'm only regurgitating what I learned from the French tuning Guru's over on VentilXP. They recommend the Bidalot RP and Giannelli Poppy Gold (both are discontinued racing pipes) for the screaming 50cc kits that have massive, like nearly 200 degree rotation exhaust ports and rev past 12k, they then recommend the conti and giannelli black gun (basically the same pipe?) for kits that rev past 11k and a little smaller exhaust duration. They all mentioned that the doppler was a mid range pipe with the best power around 8~9k rpm's. I need that tinytach STAT!

Re: moby doppler pipe clarity

Yeah with my doppler pipe and the GR1 kit it really doesn't even do anything until 7500 or 8K, with the stock clutch it would take 2 blocks or better with close to the lightest weights in it and I had 11 x 59 gearing before the pipe would even hit. Also, the doppler clutch made a world of difference on the motor. It was more noticeable then any setup I've run so far. I haven't had a chance yet but I have a friend that is going to loan me a G2 pipe so I can give it a try. Anyways this is just my experience I'm talking about. I would love to give something like a bidalot RP a try as well, might be worth trying to extrapolate the dimensions from a photo as well. I was just pointing on that you can have good success with the fairly common doppler pipe and a good 50cc and expect excellent performance. I actually had the doppler pipe on a 70cc water cooled malossi cylinder and did notice that it really only performed well in the 8 to 9K range and never really had really good top end out of it, and actually was just rather disappointed in the combination. I spent a lot of time re-working that cylinder and still really never managed to get it to do what I wanted it to though it had insane midrange power.

-naz

Re: moby doppler pipe clarity

i've had good luck using the malossi "70" kit with a slightly modded port map and the doppler pipe, I have no tach but the bikes performance at rallys and such speaks for itself its no slow poke on the top end when geared appropriately, and still rockets off the line better than 99% of the field.

however that being said I had the same if not better performance using the unmodded doppler 50cc kit with the exact same setup, the top speed is the same could even be slightly better, my off the line and accl. is not as impressive but still a puch killer once the powerband hits.

infact i think i'm gonnna go back to the doppler 50 kit and test it out. Naz's setup was impressive for 50cc at flock and the races. Also it seems that doppler would make a pipe that works well with their kit and their only kit is 50cc.

Re: moby doppler pipe clarity

Elliot, mind sharing what your Malossi 45.5D kit's port timings are? My stock kit on cases of origin has 175 degrees of opening for the exhaust and 128 degrees for the transfers, that is with one base gasket.

I'm not arguing against the doppler pipe, I still love how mine makes my moby rocket up to speed, but I'm generally curious as to how other pipes would perform on a heavily tuned motor. Well, I guess I'll bite the bullet myself and order a Gun Black pipe as recommended by the French tuners.

Re: moby doppler pipe clarity

So a G3 is going to be a better option for the 70cc Parmakit on an AV7, right?

Re: moby doppler pipe clarity

yep, it's power band starts at the lowest rpm's of any of the pipes mentioned. It will be perfect unless you want to be sweet and run the Kenji pipe, which agrees well at an even lower rpm!

Re: moby doppler pipe clarity

And the G3 mounts okay on the AV7 or do I have to find some kind of flange?

Re: moby doppler pipe clarity

it bolts right on.

Re: moby doppler pipe clarity

the human house /

i can get conti pipes but not cheap

Re: moby doppler pipe clarity

i'll have to get back at u with the port timings i don;t know off the top of my head, I'll check out my other malossi 70 kit for ya.

Re: moby doppler pipe clarity

Sweet thanks Elliot. I'm coming to realize I very well could have two av10 powered mob's on my hand if I decide to run a stock av7 crank and magnito on my current ~70cc Malossi build. And since I will have to take the thing apart to get the crank out, I might as well port that kit!

I think Benji has me hooked up with an exhaust, or la-becanerie will. Those Conti's should be cheaper then the G3 and Doppler pipes, given the going price over in France.

I still want to see the Kenji pipe ran on a modified av7 motor. That thing should work better then the G3, and it has an adjustable power band!

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