09-25-2018, 06:09 PM | #1 |
Join Date: Mar 2016
Location: Chicago, IL
Posts: 46
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Turbo on the hawk 250?
So before I go too far deep into the rabbit hole I have a few questions.
First: is there any benefit on adding a small turbo on a small engine? Second: I have the aftermarket oil cooler already installed on my hawk, can I tap into that to cool my turbo? Lastly: is it more beneficial to make it a blow through or suck carb? Thanks to everyone who responds. I kind of want to try this over the winter. I am graduating in December and I will have a lot of free time and extra cash from graduation gifts. |
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09-25-2018, 06:46 PM | #2 |
Join Date: May 2018
Posts: 77
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A efi tunable bike would be 100x better to start with if its a have to have thing.
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09-25-2018, 07:14 PM | #3 |
Join Date: Mar 2016
Location: Chicago, IL
Posts: 46
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I would love to try this but that kinda project is out of my comfort zone. I’d rather do an engine swap then trying to convert this one from carb to EFI.
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09-25-2018, 07:18 PM | #4 |
Join Date: Aug 2018
Posts: 158
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yes turbos will definitely increase engine performance on a small engine. You're essentially increasing the displacement of the hawk, which would drastically increase performance, even if you were to do a moderate blow through.
The stock hawk has a pretty low compression ratio already, supposedly 9:1, however I have a large suspect that it is actually even lower. the tt250(which is the same engine) has a compression ratio of 8.7:1, while at the same time having a thinner head gasket. so i think the hawk has an even lower ratio than that. You would need to buy the world's smallest turbo, the RHB31. this website sells clones of it for not too expensive of a price. http://www.ecotrons.com/products/sma..._turbocharger/ You can turbo a carburetor, and there are tuning ways to do so, however it's likely you'll run into fuel issues, as it needs different amounts of fuel depending on how fast the turbo is spinning. Id definitely go fuel injection, they have a lot, although it is expensive, it'll probably save ypu from blowing up an engine But to be fair, one large issue you may run into is cooling. turbos produce alot of heat, and an intercooler of some kind may be necessary to keep combustion temperatures down. Id definitely run as rich as you can, especially at WOT. I've thought alot about doing a turbo on my hawk. i decided a supercharger would be better for an off-road purpose bike(less intense power bands generally, don't have to get it spooled up), but the biggest thing stopping me is the price. If you were set on doing carbs and turbo, I say blow through for better throttle response |
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09-25-2018, 07:21 PM | #5 |
Join Date: Aug 2018
Posts: 158
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a turbo on this air cooled engine would probably put it right on the edge of blowing up the engine, or putting a hole in the piston tbh. it's a price to go fast. EFI will help, by ensuring you never run rich.
But I'd install an electronic fuel shutoff valve, aswell as an oil temperature gauge, both for safety reasons. |
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09-25-2018, 09:53 PM | #6 |
Join Date: Sep 2017
Location: N Texas
Posts: 706
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I always thought it would be cool. I have seen several vids in the past of guys with pit bikes who turbo them.
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09-26-2018, 05:04 AM | #7 |
Join Date: Mar 2016
Location: Chicago, IL
Posts: 46
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Honestly what made me want to do it was this barbie gokart that had a turbo. It's an awesome video
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09-26-2018, 05:55 AM | #8 | |
Join Date: Jan 2012
Location: ChCh , NZ
Posts: 2,266
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Quote:
you can't blow though with the carb...hows the fuel going to come up from the main jet when pressure is going down into the fuel blow blowing the fuel out the over flow all over the motor.. could also make a kool bubbly sound in the tank... can build a presurised box around the carb.... still have the kool bubbly sound... i quess you will need a fuel pump... you use the oil to lube the turbo bearing not cool it... ...
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09-26-2018, 06:55 AM | #9 | |
Join Date: May 2013
Location: finger lakes NY
Posts: 2,061
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Quote:
But it can be done....LOL |
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09-26-2018, 09:05 AM | #10 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,713
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As bogieboy stated it can be done with a carb but I wouldn't recommend it. Very tricky tuning. To easy to have it run lean and then Boom! If you are going to do a turbo , EFI is the way to go. You have to be able to control fuel mixture under boost. I've had plenty of experience in tuning with turbos on car engines. The thought has crossed my mind on doing it with the Hawk but the cost killed that idea quick. If i'm going to sink that kind of money on a complete turbo system it won't be on a 250cc engine.
I'll sit back and grab a bag of popcorn and watch this one.
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10-05-2018, 10:35 AM | #11 |
Join Date: Aug 2018
Posts: 158
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i encourage you to do this though, I'd really love to see it.
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10-05-2018, 11:27 AM | #12 | |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Quote:
Here's a fun vid of a smog pump installed on a scooter:
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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10-05-2018, 03:55 PM | #13 |
Join Date: Sep 2017
Location: N Texas
Posts: 706
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I would like to see if that actually worked. I wonder how many CFM a smog pump can push?
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10-08-2018, 07:11 PM | #14 |
Join Date: Nov 2017
Location: Suffolk Va.
Posts: 146
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I am in favor of superchargers over turbos.... I have had several cars with superchargers and lowered the pullies to make them faster... my wife has blown several Turbos in the past... but never a supercharger... Now.. Fitting this on a bike... hmmmmm I would need to think hard about this one... but trust me.. it can be done... but you need a shaft to spin the pully... you would need to take the crank to a machinist... a good one... and have him fabricate a shaft on the end of it.. and need to make a hole through the crankcase... and go from there...... a lot of trial and error...
I am sure that a motorcycle speed shop will have a good idea if they haven't already done it....
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10-14-2018, 01:56 AM | #15 |
Join Date: Nov 2016
Location: robertsdale alabama usa
Posts: 1,007
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i have a pic of one on a ktm if i can find it ill post
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Tags |
cityslickerrick, hawk 250, oil cooler, turbo |
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