RPM Questions?

[blaster hybrid]

A stock blaster pulls 8500 rpm's... Due to my concerns i wanted to know if with a after-market pipe like Toomey, or power pro's there will be a significant change in rpm's? Im trying to get my overall speed at WOT But im using a speed calculator and i need to know what rpms my bike is throwing out. Thank You.

 

[UncagedShadow]

completely stock pulls more like 8000 rpm. But try this out to calculate your top speed. You keep each gear the same, put the size of your sprockets, put your tire size in, and then put the rpm you think your pulling. A good mid to top pipe, porting, and a few other things can get you turning 9000. I would say 8500 with just a good pipe.

 

[blaster hybrid]

How about a low to mid pipe???

 

[UncagedShadow]

probably 8200 - 8500. Nobody really knows 100%. That program is just to help give you an estimate of top speed from gearing and tires. Now rpm as we know is how fast the engine is turning, so opening up air flow trough pipes, filters, porting ect, and lightening components all allow the engine to turn gradually higher rpm... I personally see a blaster motor turning 9500 with full drag mds, and lightening of components, I.E. flywheel, balance shaft, stuff like that...

 

[99LRDblaster]

A stock blaster pulls 8500 rpm's... Due to my concerns i wanted to know if with a after-market pipe like Toomey, or power pro's there will be a significant change in rpm's? Im trying to get my overall speed at WOT But im using a speed calculator and i need to know what rpms my bike is throwing out. Thank You.

Top speed doesn't really mean anything, but at any rate, a stock Blaster pulls more around 8300rpm. I wouldn't get too infatuated with the RPMs as it's pretty pointless if you are developing lower power at higher RPMs anyways. Sure.....a Blaster can rev to 9000rpms, but if it's making less power at 9000rpms than it is at 8000rpms then it's a pretty worthless point to make. Look more into gearing and tire size if you want top speed rather than a couple hundred RPMs.

 

[hudack]

yes lrd your right but hes trying to caculate it so imputing what the pipe revs to would help him get a better idea

 

[blaster hybrid]

Exactly hudack im trying to find out the closest speed with a toomey, or power pro pipe. While running stock gearing.

 

[99LRDblaster]

yes lrd your right but hes trying to caculate it so imputing what the pipe revs to would help him get a better idea

Generally with an aftermarket pipe, peak power is reached at lower RPMs.....with the Blaster at least. It's difficult to increase RPMs on modded single cylinder engines unless you are increasing airflow and/or going to a long rod setup for a particular setup.

 

[hudack]

Generally with an aftermarket pipe, peak power is reached at lower RPMs.....with the Blaster at least. It's difficult to increase RPMs on modded single cylinder engines unless you are increasing airflow and/or going to a long rod setup for a particular setup.

yes but an aftermarket part creates a good bit of over rev on a blaster witch you got to take into acount

 

[99LRDblaster]

Exactly hudack im trying to find out the closest speed with a toomey, or power pro pipe. While running stock gearing.

You will probably only gain 1-2mph and top out somewhere between 56-58mph if you have stock 21" rears on it.

 

[99LRDblaster]

yes but an aftermarket part creates a good bit of over rev on a blaster witch you got to take into acount

Overrev however isn't going to make you go much faster as most pipes are pretty abrupt at losing RPMs in overrev scenarios. That becomes a matter of calculating how much power you are generating at RPMs. Even at that point, on stock blaster gearing, you are just spinning your wheels more at a steady speed than actually going much faster. So how much more do you gain in terms of realistic amounts of power...100-200rpm....if you're lucky but the loss in overall peak power at those RPM ranges somewhat negates their effects in the first place. A piped Blaster generally just goes a little faster since it has more nuts to push through the drag of the wind where the stock Blaster tends to have more issues getting up to that point....hence why many put 8000rpms as being more realistic of the RPMs on the stock Blaster even though in reality the engine does turn more RPMs as a whole in terms of peak power and even has less drop off in overrev.

 

[blaster hybrid]

My friends blaster has a toomey pipe, k&n filter, and a port and polish for topend.. Do you have any estimate numbers of rpm's his motor is throwing out?

 

[darederek]

i just did the math the other day its in another thread here. i didnt use no stupid calculator jk man. but i put in 8500 rpm for my calculations because looking at the dyno from toomeys site tht lrd put on those pipes peak generally around 8500.

 

[blaster hybrid]

Great input lrd .. I understand what u r trying to say.

 

[99LRDblaster]

My friends blaster has a toomey pipe, k&n filter, and a port and polish for topend.. Do you have any estimate numbers of rpm's his motor is throwing out?

In terms of RPMs where peak power is reached, he is probably pulling the same or slightly less RPMs than you are putting out stock. I don't know his overall work, so I couldn't say for sure. It's not a real cut and dry issue. A lot is influenced simply by the amount of drag and weight you have on the quad itself.

 

[99LRDblaster]

i just did the math the other day its in another thread here. i didnt use no stupid calculator jk man. but i put in 8500 rpm for my calculations because looking at the dyno from toomeys site tht lrd put on those pipes peak generally around 8500.

According to Toomey's graph, they are making peak power around 7900ish. As far as beneficial overrev, I'd say maybe up to 8200rpm.