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Index > @ the Pickup Bed (General Topics) > Thread: MOST HORSEPOWER
Thread: MOST HORSEPOWER
californiaroll


Newbie
Posts: 8
posted April 04, 2006 04:11 PM

MOST HORSEPOWER

Does anyone know the most horsepower you can get without having to use racing fuel?

         
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klaus42


Rotorhead
Posts: 1877
posted April 05, 2006 12:13 AM

Do you have the kind of $$$$$$ ...

...that finding the answer will take?

How long does the motor in question have to last?

Do you have an appropriate chassis for it?

Enough road to run it?

Big enough balls to find out?

       
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RotaryRob


Revvin Up
Posts: 53
posted April 05, 2006 09:42 AM

Kewl thing about Wankel cycle engines.... They don't even LIKE racing fuel. We have found that SCCA GT race engines actually make MORE power on pump gasoline. 3rd Gen Rx7s that are pumped up evn more to make over 300 HP on the street don't need racing gasoline. Before SCCA required everybody to use racing gasoline so they could catch cheaters, we would save enough on fuel for a weekend to nearly pay our entry fees. It has to do with the low compression ratio and thre traveling combustion chamber.

Happy Rotoring,

Rob Barr
____________
'77 RPU
'75 RPU (V-6)
'76 Courier
Rotary Sprite (3 - 2 project)
'85 IT 7
EP '85 Rx7 (in progress)
'85 GSLSE (4)
C6 Corvette Roadster

       
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californiaroll


Newbie
Posts: 8
posted April 05, 2006 12:38 PM

quote:
...that finding the answer will take?

How long does the motor in question have to last?

Do you have an appropriate chassis for it?

Enough road to run it?

Big enough balls to find out?
prob don't have big $ to fing out. how much $ would it take?

The motor has to last a while pref a street strip motor.

How strong is the repu chassis?

Just enough road around norcali expressways stoplights & up the mountain roads ect.

Yes i have big kamakase balls to find out! especially against v8's & VTEC honda's

THANK'S ALOT FOR THE REPLY!!!

         
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californiaroll


Newbie
Posts: 8
posted April 05, 2006 12:50 PM

quote:
Kewl thing about Wankel cycle engines.... They don't even LIKE racing fuel. We have found that SCCA GT race engines actually make MORE power on pump gasoline. 3rd Gen Rx7s that are pumped up evn more to make over 300 HP on the street don't need racing gasoline. Before SCCA required everybody to use racing gasoline so they could catch cheaters, we would save enough on fuel for a weekend to nearly pay our entry fees. It has to do with the low compression ratio and thre traveling combustion chamber.

Happy Rotoring,

Rob Barr
thank's alot for Reply Rotary Rob!, that's great they like regular pump fuel! so i guess they can make a little over 300hp on regular pump gas.That's sad i was hopeing alot more hp to stay up with the 500+hp v8's around here.

         
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klaus42


Rotorhead
Posts: 1877
posted April 06, 2006 10:08 AM

The HP number doesn't say it all.

The combination of gear ratios + powerband characteristics of particular engine configurations vs. total weight --not to mention suspension mods, driver 'style', etc.-- will have more to do with the 'final outcome'.

A 200 HP REPU could well be quicker, up to a point, than some 500 HP V-8 driven by an overeager teenager, for example...

You might want to look into the pioneering work done by Racing Beat over the last decades, (resulting in Bonneville Records, among other wins), as well as the supercharger offered by Atkins, aka the 'Camden'.

(Bottom line: it all takes $$$$.) :)

       
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RotaryRob


Revvin Up
Posts: 53
posted April 06, 2006 10:33 AM

Hey California,

I've been really surprised at how many of you are using your RPU's for sort of "street rods".... You CAN go after your V8 buddies with a rotary but not a pickup ... Afterall ... it is a TRUCK!! A few years ago in Arizona I allowed myself an occasional street duel with some hot shot in a Camero or a 911 Porche, etc., while driving my rotary powered '62 Austin Healey Sprite. It was quite satisfying to see the humiliated drivers in the mirror looking for the first place to turn off to avoid me after I stomped them. The highest HP claim I've ever heard of for two rotor rotary is about 450 for land speed record cars pumped to the max for a short burst and turbo charged with iced-down intercoolers. If you want to really go fast on the street with a rotary, put a 20B in a Lotus Super 7 kit car. You can stay under 1,000 lbs and make about 450 HP without NOS or blower - (better get some sticky tires). BTW...Still have the old Sprite and it is for sale.

happy rotoring....

____________
'77 RPU
'75 RPU (V-6)
'76 Courier
Rotary Sprite (3 - 2 project)
'85 IT 7
EP '85 Rx7 (in progress)
'85 GSLSE (4)
C6 Corvette Roadster

       
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Tom93R1


Redlining
Posts: 458
posted April 06, 2006 10:34 AM

300HP REPU would be pretty amazingly fast! I would bet that a limited slip and some big tires would make a 300HP REPU on par with most 500HP V8 cars.

300-350 is a good range for reliable HP on a turbo'd 13b rotary engine. You can do that with no internal work, just some boost, engine management and a few bolt ons.

HP isnt the only important number when you want fast. There are a few other things that come together to make 500HP rx7's as fast or faster on the drag strip than 1000HP Supras.
____________


'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!

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californiaroll


Newbie
Posts: 8
posted April 06, 2006 01:16 PM

THANK'S ALOT GUYS FOR YOUR KNOLEGE!!!^_^

         
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Brad


Rotorhead
Posts: 1672
posted April 06, 2006 01:42 PM

with a peripheral ported 13b

and a Gene Berg 58mm IDA copy with 48mm chokes you can make 350 flywheel hp.

on pump gas.


lots of pump gas.


like 10mpg.


i've personally seen 2 of these setups.

It'll need a close ratio box and LSD to get the most out of it. Pleanty of room in the rear fenderwells for tires. I got 245/50/15's with much room to spare.
____________
-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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californiaroll


Newbie
Posts: 8
posted April 06, 2006 03:07 PM

quote:
and a Gene Berg 58mm IDA copy with 48mm chokes you can make 350 flywheel hp.

on pump gas.


lots of pump gas.


like 10mpg.


i've personally seen 2 of these setups.

It'll need a close ratio box and LSD to get the most out of it. Pleanty of room in the rear fenderwells for tires. I got 245/50/15's with much room to spare.
wow! 10mph! wonder if that's the same for turbocharging also? cool so you don't have to cut & tub the bed for big tires.so how did those 2pport setups run? any victories?

         
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Brad


Rotorhead
Posts: 1672
posted April 06, 2006 09:10 PM

quote:
wow! 10mpg! wonder if that's the same for turbocharging also? cool so you don't have to cut & tub the bed for big tires.so how did those 2pport setups run? any victories?


turbocharging is capable of making more hp, more low end torque, and won't kick and buck under 4000rpms like bridge or peripheral. But costs more $$ initially.

those motors ran great. One in SCCA ITE in socal; beat most cars in class including aturbo 911, a 12:1 compression 911, turbo 1st gen 300z, and traded victories with a pumped saleen mustang. It was also very well setup and driven. And had 45hours on carbon seals still ran good.

The other one is in a no holds barred formular car and destroys the competition. A real treat to hear and see.


____________
-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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