looking for advice with a blow thru carb set up for a turbo salt flat runner,,,any help would be greatly appreciated
:?
This has been discussed:
http://www.landracing.com/forum/index.php/topic,4333.0.html (http://www.landracing.com/forum/index.php/topic,4333.0.html)
http://www.landracing.com/forum/index.php/topic,5833.0.html (http://www.landracing.com/forum/index.php/topic,5833.0.html)
I don't see a lot in those links that apply to your situation rascalion. Why don't you go into some more detail about what you want to set-up and why you want to use a blow-thru. I think if you are more specific, you will get some more detailed responses.
my advice don't do it.....
Kent
Turbos can generate a lot of heat if you aren't intercooled, I wouldn't be surprised if you boil the fuel in the floatbowl. Pre-turbo is going to be easier to jet across the whole boost range.
But if you must, pretty much all you need to do is run the float bowl vent line into the boosted air side, not atmosphere. Make it secure, as the factory vent tube can pop off when boosted. Oh, and you need to make a vent fitting on top of the slide or it will go WOT when you hit boost. Plumb that into boost too. For safety reasons, I'd only use a carb that was "push-me-pull-you" or whatever the right name is. A CV carb would probably be a bad idea as well.
Some guy named Toy did pretty good with one..and it was a kawapookie too..
John
Quote from: rascalion on February 01, 2010, 06:41:43 AM
looking for advice with a blow thru carb set up for a turbo salt flat runner,,,any help would be greatly appreciated
:?
What bike is involved? Lots of info available on the older model Kawasaki and Suzuki four cylinder engines and blow thru turbo.
Even through you can go this way (blow thru carb) using either electronic or mechanical injection seems to be a better way to go...
Hilborn still sales the injectors for making the conversion on the above mentioned engines..
Buzz
wow thanks to all for the responses,,,my limited knowledge of fuel injection and budget make using injection difficult for my first attempt...the bike in progress is based on an 883 sportster,,,am in the process of modifying/altering the frameand doing the headwork,,have pistons on order from Dan at nhrs,,a gt15 turbo to plumb and a dream.....any help is greatly appreciated
am not against fuel injection but am old school and kind of leary of it
could y'all recommend basic books on fuel injection,,,maybe reading a bit will help remove my apprehension
Quote from: John Noonan on February 01, 2010, 02:06:28 PM
Some guy named Toy did pretty good with one..and it was a kawapookie too..
John
The only benefit I can think of is you can use a smaller carb post-charger, (or use the factory carb(s) in the stock location) and save a little money. Not a lot of money, because you can sell you stock carb(s) to defray the cost of buying a single carb. Back when I had a turbo KZ650, we just bought a used Harley carb and made a manifold to replace the stock carbs. It gave more room, and the main jet was adjustable with a simple knob.
Rascallion, not too hard to do on a Sportster,I ran blow thru on one of my Buells. Used a 42 Mikuni,ran boost lines to bowl vent and carb body. Had an Aerocharger on it,worked well--190 HP. Need a boost referenced fuel pressure regulator, an electric fuel pump that will put out at least 5 psi more than your projected boost. Fuel return line from regulator to tank. Is the GT-15 a ball bearing turbo--as HD engines do not have enough oil pressure for a plain bearing turbo--being a ball bearing engine.Carb had a special needle and seat for pressure available from Mikuni.And an intercooler would be good!
Firemanjim: did you have any problems with the float collapsing under boost pressure? plan to only run about 10 lb. at first,,,do you recall the specs on the needle and seat....plan on using a separate oil pump system for the turbo,,unfortunately gt15 is not ball bearing,,,plan on intercooler and considering the possibility of water injection,not convinced about water yet.
From what I recall you need a #2.3 needle and seat for the HSR 42 Mikuni and the "A" needle as well, I seem to remember that is what I used on mine..and it worked great..call up Steve at Mikuni in sales/tech and he will get you what you need.
John
rascalion, do you have an intercooler yet?
WOW.....John has recall :-D
does this mean his gas pedal is sticking? :?
Lynda
nope no cooler yet,,, been toying with the idea of a heat exchanger type arrangement,,,not sure which way to cool the air,,,,any suggestions....all of you are great,,,,really appreciate the advice
thanks
At various times during the 90`s Joe Haile published a magazine called "Turbo Bike & Motorcycle Performance". There are a few articles on blow through setups on inline jappers. These mags. are still avilable (try googleing). I have a complete set, if you cant find any, pm me. 8-)
Quote from: rascalion on February 02, 2010, 09:07:24 PM
nope no cooler yet,,, been toying with the idea of a heat exchanger type arrangement,,,not sure which way to cool the air,,,,any suggestions....all of you are great,,,,really appreciate the advice
th. anks
I found a good deal on this intercooler and bought it http://www.frsengineering.com/pp18.jpg Afterwards, I changed to a narrower fairing and it will no longer work. If it looks like it would work for you, let me know. I'll pass it on for the same deal.
you sir are a scholar and a gentleman,,,i am very interested in the cooler,,,please advise on how to proceed
Cooler core dimensions are 9"W X 7.5"H X 4"thick, overall width is 15.5" and the ID of the inlet and outlet is 2".
I paid $100 for it (shipping included) If want it, PM your shipping address to me and I will tell you where to send a check.
Randy
randy ill take that cooler..... i need it for Randy's 500
kent
rascalion and Kent, PM set
Quote from: 1212FBGS link=topic=7438.msg :cheers:
/quote]
Wait, I need it for Michelle's 500 :cheers: :cheers:
:wink:
Time for a bidding war!!
Harv
Quote from: hitz on February 05, 2010, 08:01:12 AM
Time for a bidding war!!
Harv
No need for that, those intercoolers are still available for $102 (total including shipping) here: http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&_rdc=1&item=350313022739&ru=http%3A%2F%2Fshop.ebay.com%3A80%2F%3F_from%3DR40%26_trksid%3Dp3984.m38.l1313%26_nkw%3D350313022739%26_sacat%3DSee-All-Categories%26_fvi%3D1&viewitem