R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Reply
 
Thread Tools Search this Thread
Old 04-09-2009, 03:08 PM   #1
Tech Master
 
omarwashington's Avatar
 
Join Date: Aug 2008
Location: Kenmore, WA
Posts: 1,088
Trader Rating: 2 (100%+)
Default on road engine in buggy

Is this possible? I've always wondered if this is possible. Those on road engines sure are high reving mills.
__________________
RCCARS!
omarwashington is offline   Reply With Quote
Old 04-09-2009, 03:14 PM   #2
Tech Lord
 
Jaz240's Avatar
R/C Tech Elite Subscriber
 
Join Date: Aug 2008
Location: Dwindle city
Posts: 12,492
Trader Rating: 52 (100%+)
Default

Quote:
Originally Posted by omarwashington View Post
Is this possible? I've always wondered if this is possible. Those on road engines sure are high reving mills.

it is possible but not very practical..you would have to tame it down so much to have any usable power you would just be wasting the added power...on-road cars have much better traction, handling and center of gravity, they benefit from the instant power..in off road all you would likely get is severe tire spinning
__________________
nothing to see here................................
Jaz240 is offline   Reply With Quote
Old 04-09-2009, 03:19 PM   #3
Tech Master
 
Owen RaCing's Avatar
 
Join Date: Jan 2007
Location: Mountain Valley
Posts: 1,940
Trader Rating: 17 (100%+)
Default

Ive seen it done. But from what Ive seen, heres the problems.

-Cases are not built to take the punishment of being flipped over, and all the ruff flex from the chassis bent around.

-Cooling heads have less surface area since the on roaders are pushing the air by them so much faster. And they help keep the gravity low.

-Extreme top end, boring bottom. The on roaders carry alot more speed, so in some cases bottom is not even needed.

Its alot of power you really dont need. Powers fun and all, just not always needed. Any of the new top line Off Road .21's will be more than enough
__________________
powered by anti-anxieties, sarcasm and chipotle
Owen RaCing is offline   Reply With Quote
Old 04-09-2009, 09:31 PM   #4
Tech Regular
 
Timmo's Avatar
 
Join Date: Sep 2008
Location: South Florida
Posts: 498
Trader Rating: 15 (100%+)
Default

I think you will not have enough low end torque to get over your jumps when needed.I mean if you need instant power right then and there when a jump is right around the corner,you won't have the bottom end to push it over with an Onroad engine.
Timmo is offline   Reply With Quote
Old 04-09-2009, 10:04 PM   #5
Tech Addict
 
Join Date: Mar 2009
Posts: 725
Trader Rating: 12 (100%+)
Default

I agree that unless you race on a smooth track without any short run ups, the on road engine wont have the torque to move that the off road engines do. The benefit is that the power band though changed would be wider and smoother. Also the motor will rev alot higher, but also consume more fuel. Can be done, but some draw backs were also stated earlier like the case design not being able to withstand the punishment, surface area of the head, etc. I would go with a good off road engine if possible. I few years back, I seen a guy running a sirio on road engine in his LSP. Tamed the bottom end, and had to change his CB to get max use of the rpm's and powerband. Though it was fast, it sure ate alot of fuel quickly.
__________________
HB D8T with BCE Chassis, ACE Shock towers and motor mounts, M2C Rear Suspension system, KH front steering plate and chassis braces, Lunsford Ti-turnbuckles & hinge pins, OS Speed motor, Hitec 5995TG steering, Futaba 9351 throttle/brake, OS 2060 pipe, and J concepts Punisher Body.
HB D8: CEO Mods Novarossi P5K with JP4 tuned pipe, JR 9000T steering, JR 8800T throttle.
gotspeed_2000 is offline   Reply With Quote
Old 04-09-2009, 10:34 PM   #6
Tech Prophet
 
houston's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2004
Location: portland OR
Posts: 15,088
Trader Rating: 91 (100%+)
Default

you guys are right , we have tested it

the onroad engines are timed different , port heights are way different , all of this changes power delivery . the power is very low on the lower end of the engine .
__________________
TEAM FUSION X ENGINES / TEAM BYRON ORIGINALS / TEAM PROLINE RACING TIRES / TEAM SICK GRAPHICS /TEAM KYOSHO / things I support: COMP HEAT DEALER /TEAM LUNSFORD/ FUSIONX™ USA / TEAM KYOSHO / "H.E.S."™ / BYRON FUELS / RC-OMGUSA/KICWEBDESIGNZ/AKA TIRES/PROLINE RACING TIRES /RAYA RACING/BUKU POWER CLUTCH/M2CRACING/special thanks to STAV and JIM HOTTIGREENMOUNTAINGRILLS.COM
houston is offline   Reply With Quote
Old 04-09-2009, 11:00 PM   #7
Tech Master
 
omarwashington's Avatar
 
Join Date: Aug 2008
Location: Kenmore, WA
Posts: 1,088
Trader Rating: 2 (100%+)
Default

intresting read guys. I've always wondered now i know
__________________
RCCARS!
omarwashington is offline   Reply With Quote
Old 04-09-2009, 11:13 PM   #8
Tech Adept
 
Join Date: Sep 2008
Location: US
Posts: 220
Default

I've had first hand experience with this when I got a Rody Mod RB C5 on-road that I stuck in my Losi 1.0. At the time I already knew that on-road engines lack bottom-end so I installed a JP1, Losi clutch with all alu shoes and silver springs (heaviest springs) to get more bottom-end, but still wasn't enough. My local track is a medium size track so I could never stretch the top rpm of the engine. But overall the things was ballistic from mid to top.
Losi-Runner is offline   Reply With Quote
Old 04-09-2009, 11:36 PM   #9
Tech Prophet
 
houston's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2004
Location: portland OR
Posts: 15,088
Trader Rating: 91 (100%+)
Default

Quote:
Originally Posted by Losi-Runner View Post
I've had first hand experience with this when I got a Rody Mod RB C5 on-road that I stuck in my Losi 1.0. At the time I already knew that on-road engines lack bottom-end so I installed a JP1, Losi clutch with all alu shoes and silver springs (heaviest springs) to get more bottom-end, but still wasn't enough. My local track is a medium size track so I could never stretch the top rpm of the engine. But overall the things was ballistic from mid to top.
__________________
TEAM FUSION X ENGINES / TEAM BYRON ORIGINALS / TEAM PROLINE RACING TIRES / TEAM SICK GRAPHICS /TEAM KYOSHO / things I support: COMP HEAT DEALER /TEAM LUNSFORD/ FUSIONX™ USA / TEAM KYOSHO / "H.E.S."™ / BYRON FUELS / RC-OMGUSA/KICWEBDESIGNZ/AKA TIRES/PROLINE RACING TIRES /RAYA RACING/BUKU POWER CLUTCH/M2CRACING/special thanks to STAV and JIM HOTTIGREENMOUNTAINGRILLS.COM
houston is offline   Reply With Quote
Old 04-10-2009, 03:09 PM   #10
Tech Master
 
PowerHouse's Avatar
 
Join Date: Nov 2007
Location: Buffalo, New York
Posts: 1,351
Trader Rating: 66 (100%+)
Default

I guess I am trying to defying physics then I am doing some experimenting with some onroad sleeves in offroad engines. I am currently working with the GRP line of engines and have done all the measurements and even though the sleeve port configuration and timing is a little different, I am finding that it is not drastic enough to really affect low end power and in fact I am getting more low end out of them with the added exhaust area. The added exhaust area from the onroad triple exhaust port gives the engine an increase in all around power and the breathability the engine will have, will also help with the fuel milage increases. The transfers are slightly higher than the offroad sleeve but I raise them a little anyway so it ends up being spot on, so basically you could in theory, drop an onroad GRP .21 sleeve in the offroad block and run it without giving up low end and getting more midrange and top end. I can't say this for all onroad engines as I have not tried to make an offroad engine out of every one out there but I have taken a turd of an offroad engine and made it an onroad contender and now I am taking onroad engines and making them offroad contenders. If the port timing isn't what it should be, then you make it what it should be. You have to think outside of the box with this one but I will make it happen and you guys will see the prototypes in Tillsonburg next week. It has already been called the GRP Frankenstein engine I'm not sure why as it look like any other engine from the outside but will be a combination of 3 different engines into one on the inside. I'm even taking the GRP rally engine and making it a Truggy motor next week
PowerHouse is offline   Reply With Quote
Old 04-12-2009, 03:18 PM   #11
Tech Elite
 
razzor's Avatar
 
Join Date: Aug 2005
Location: Durban, South Africa
Posts: 2,810
Default

Quote:
Originally Posted by PowerHouse View Post
I guess I am trying to defying physics then I am doing some experimenting with some onroad sleeves in offroad engines. I am currently working with the GRP line of engines and have done all the measurements and even though the sleeve port configuration and timing is a little different, I am finding that it is not drastic enough to really affect low end power and in fact I am getting more low end out of them with the added exhaust area. The added exhaust area from the onroad triple exhaust port gives the engine an increase in all around power and the breathability the engine will have, will also help with the fuel milage increases. The transfers are slightly higher than the offroad sleeve but I raise them a little anyway so it ends up being spot on, so basically you could in theory, drop an onroad GRP .21 sleeve in the offroad block and run it without giving up low end and getting more midrange and top end. I can't say this for all onroad engines as I have not tried to make an offroad engine out of every one out there but I have taken a turd of an offroad engine and made it an onroad contender and now I am taking onroad engines and making them offroad contenders. If the port timing isn't what it should be, then you make it what it should be. You have to think outside of the box with this one but I will make it happen and you guys will see the prototypes in Tillsonburg next week. It has already been called the GRP Frankenstein engine I'm not sure why as it look like any other engine from the outside but will be a combination of 3 different engines into one on the inside. I'm even taking the GRP rally engine and making it a Truggy motor next week

I have done this with a Axe Mamba engine.
swapped internals to a Cobra onroad piston and sleeve after the original piston got damaged.
The motor has enough bottom and feels smoother in its power delivery with strong mid to top end.
Doing the same to my X1 Cobra since i broke the rod overreving it on the starter box by accident.
__________________
Casterracing ZX1.5R
casterracing EX-1 Pro, SP Silver Arrow
TOP Racing Scythe, SP 17.5, SP GT Pro 2.0
TOP Racing Scythe, SP 4.5 V2, Hobbywing Xerun 120SD 2.0
TOP Racing Scythe, SP 13.5, Hobbywing Xerun 120SD 2.0
razzor is offline   Reply With Quote
Old 04-12-2009, 03:49 PM   #12
Tech Prophet
 
houston's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2004
Location: portland OR
Posts: 15,088
Trader Rating: 91 (100%+)
Default

what was the question again? was it putting an onroad sleeve in an offroad block ? exhaust heighths are different for sure
__________________
TEAM FUSION X ENGINES / TEAM BYRON ORIGINALS / TEAM PROLINE RACING TIRES / TEAM SICK GRAPHICS /TEAM KYOSHO / things I support: COMP HEAT DEALER /TEAM LUNSFORD/ FUSIONX™ USA / TEAM KYOSHO / "H.E.S."™ / BYRON FUELS / RC-OMGUSA/KICWEBDESIGNZ/AKA TIRES/PROLINE RACING TIRES /RAYA RACING/BUKU POWER CLUTCH/M2CRACING/special thanks to STAV and JIM HOTTIGREENMOUNTAINGRILLS.COM
houston is offline   Reply With Quote
Old 04-13-2009, 05:39 AM   #13
Tech Adept
 
chunk t's Avatar
 
Join Date: Nov 2008
Location: Elgin, IL
Posts: 225
Default

In my 2-wd stadium trucks I like to run an engine with slightly elevated Trans & Exhst port timing. For my driving style I don't want a lot of low-end grunt, I just end up spinning the wheels a lot , so I set my egines soft on the bottom with a strong mid to upper end.
__________________
chuck "chunk" thomas
.......
1:10, 2-wd Stadium Trucks
B-Mod Tunnels
.......
If ignorance is bliss... I must be in heaven!
chunk t is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
GT class--buggy-based on road! duneland Nitro On-Road 9643 11-16-2016 03:11 AM
Off roader thread Danny Teh Malaysian R/C Racers 6647 04-07-2015 02:57 AM
New Hot Bodies Buggy!!??????? monsteraddict Nitro Off-Road 14489 03-18-2013 01:42 PM
New 1/8 on-road "XR8" dino.tw Nitro On-Road 966 07-11-2011 11:57 PM
Snake Alive..... Come in if you dare pink Malaysian R/C Racers 686 08-12-2005 01:55 AM
RB Europa s7 buggy engine(trade for a .12 on-road engine) broughamlover R/C Items: For Sale/Trade 14 08-28-2002 11:44 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 06:43 AM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net