Approx. 300R HP?

[300rman]

i know that a stock air R pulls around 35 HP, from what i have heard/read.
just wondering in what range a air 300r with a larger carb and pipe would approx. pull? not looking for accurate numbers, just best educated guesses here :)

[TwoHundredEx]

A stock air R is 29hp. If I had to guess what a 300R would pull I'd say anywhere from 35-40hp?
But that's just a guess like I said. Someone who knows more about this will give you a more accurate number.

[scrawny]

bah, a good running 265 national motor makes 47, i bet a 300 would be like 50.

[1upfront]

An 84R has 29hp the 300r kit adds 8 hp with the kit alone, go with a bigger carb and you'll have an even bigger gain.

[NINJA]

bah, a good running 265 national motor makes 47, i bet a 300 would be like 50.

Whoa, hold on there, you're comparing two completely different motors there. The 265 national motor is out of the liquid Rs and a very stout well rounded setup. The 300R kit he is referring to is of the air cooled motors. My guess for your setup when jetted properly and with the pipe and bigger carb would prolly be around 42-44 hp.

[scrawny]

damn...missed the whole word "air" in his first post...my bad.

[1upfront]

Actually liquid cooling has nothing to do with max HP It only increases the lifetime of the moving parts in the topend, I personally know guys with 246cc blasters that run 4.8's in the 300ft and I'll be breaking into the 4's next season as well on my 300r. So if you see me or any of my aircooled buddies at the drags you'd better be ready!

[SWIGIN]

i think he ment that the water cooled motors are desighned better then the air coolers

like stock 84 vs. stock 85

[Huffa]

Actually liquid cooling has nothing to do with max HP It only increases the lifetime of the moving parts in the topend, I personally know guys with 246cc blasters that run 4.8's in the 300ft and I'll be breaking into the 4's next season as well on my 300r. So if you see me or any of my aircooled buddies at the drags you'd better be ready!

I think your wrong, with LC you can run piston/ring tolerences a bit tighter giving it a bit more HP i would think ?? + once they are both running and totaly heated up, the air will begin to lose more horsepower then the LC for sure due to higher temps.

[1upfront]

Huffa you must also remember I'm a dragracer and engine heat is not an issue in my case, I personally have never had my bike get hot enough to effect performance but I have seen a few banshees heat up and boil over at the races.
Besides both bikes are aircooled in theory it takes air to cool the water in the radiators before the water can cool the engine.

[scrawny]

under full power, i would bet anything that the air cooled cylinder/piston temp is quite a bit hotter than the wet one.

what do you run your ring endgap at? im sure like was stated before, its looser than the liquid. maybe alcohol bikes might be a little less different cause they run REALLY cold.

[Huffa]

Huffa you must also remember I'm a dragracer and engine heat is not an issue in my case, I personally have never had my bike get hot enough to effect performance but I have seen a few banshees heat up and boil over at the races.
Besides both bikes are aircooled in theory it takes air to cool the water in the radiators before the water can cool the engine.

Oh I agree with you in your case but you were stating it as a general statement I assumed.

[1upfront]

under full power, i would bet anything that the air cooled cylinder/piston temp is quite a bit hotter than the wet one.

what do you run your ring endgap at? im sure like was stated before, its looser than the liquid. maybe alcohol bikes might be a little less different cause they run REALLY cold.

I go by the book with an end gap of 0.20mm to 0.40mm and I use leaded racing gas.

[nate b]

35-36 hp..................

[1upfront]

I would say 37 with stock carb and you'd be getting into the 40's with a pipe 36-38mm pwk and reeds.

[300rman]

power reeds, PK 38 carb, DG pipe/silencer.....uh.......FL350 intake boot. all i can remember right now.

and the approx. running temp for this motor gets about 225-250 degrees, sometimes reaching to 270 ish. with the mikuni carb that i just couldnt get jetted properly it was hitting 335 +.

but our stock blaster runs at around 225-250, so i am going to assume that my R is running at the proper temp as well.

['83 250R]

i have a 83 250r with carbon fiber reeds, DG head and pipe, brand new wiseco .50 over a K&N filter and a mukuni 36mm flat slide and i talk to a guy that builds air cooled race motor and he said with V-FORCE reeds and with him to port and polish and all his other secrets i would get 48-52 horse power! and that only a 250 cylender not the 300r

[300rman]

well, my total list of mods is in my sig. i think the biggest kicker is the fact that im not running a counterbalancer, due to the balanced crank. i think about the only thing i can do to it is get a better pipe, take to to PR and have them port it and have them work the head over and raise the compression......

[The Goat]

dino...or stfu.

[300rman]

dino...or stfu.

if i knew a place that had one and didnt want an arm and a leg, i would be there in a second!

[Bigbore]

I don't know where the high HP numbers are coming from...:wondering .

BUT, The stock HP for the '83 and '84 Air cooled R's are 24.7 hp. The Hondaline Kits add 7HP, that's it! Per Dirt wheels test article on the 300 kit ON THE DYNO). Now thats for a stock kit.

Even the Mugen 360 Stage 2 Kit only adds 13 HP which would bump the HP to 38HP total (and thats with a 36mm Mikuni carb and the Mugen pipe), per 3 Wheeling Mag September/October '81.

[Dirtcrasher]

Yes but 300R man has a special - snapped off and smoothed out piston sleeve skirt :lol: Makes more ponies and it's lighter too....

[300rman]

Yes but 300R man has a special - snapped off and smoothed out piston sleeve skirt :lol: Makes more ponies and it's lighter too....

Hey now! im not tossing numbers around!

[The Goat]

yeah, but the numbers that ARE being tossed around are ridiculous.

http://www.geocities.com/gtthunder.geo/300r.jpg

this is a liquid R not an air...ported, and ported well..notice the numbers that are being thrown down.

so I'm agreeing with bigbore...and I MIGHT go so far as to agree with nateb if the aircooled gods are smiling on you that day.