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  #21  
Old 03-04-2013, 03:59 PM
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I am quite excited for this. I just need to start saving money. Step 1 will be to build/buy a motor if I get a 420cc and then efi it and then turbo it. The 420s increased price tag would slow down my build.
  #22  
Old 03-04-2013, 05:54 PM
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Originally Posted by Jblankster View Post
I am quite excited for this. I just need to start saving money. Step 1 will be to build/buy a motor if I get a 420cc and then efi it and then turbo it. The 420s increased price tag would slow down my build.
Don't let that slow you down look on ebay, you can find used ones in good condition for around $200.
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Old 03-04-2013, 07:47 PM
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Unless its a honda you may not want to start something like this with a used block.
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Old 03-04-2013, 08:30 PM
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If he plans to build everything up anyway why not just start with a bare racing block.
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Old 03-04-2013, 08:39 PM
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i totally forgot about this.. and doesnt add much to the motor but runs off a live axle..

take a big block chevy smog pump which can be had at junk yards for close to nothing..

run a pulley on the live axle and plumb it to the intake. its works but for noticable gains the motor has to be bigger.
  #26  
Old 03-05-2013, 01:35 AM
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Not to rain on your parade but don't bother with the turbo. The extra weight for all of it alone makes it not worth it. You'll notice minimal power increases compared to other mods.
It would add maybe 4 pounds to the kart. Not to mention the 420cc blocks are already 70 pounds.


A 10:1 e85 boosted motor will **** on a NA motor if its done right.

5-10psi. Figure the standard 11hp per pound in a normal size car. I know that is off for a small engine like this. But when it's done it will be in thee 40+ hp range.
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Old 03-05-2013, 06:19 AM
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4lbs? The turbo maybe then you have your oil pump, waste gate, piping ext... more like 15-20lbs.
None of that matters though the fact is if you want power turboing these small engines is not the way to go. They won't build enough boost to justify a turbo setup, you may push 1-2lbs of boost if you're lucky. There is much easier ways to get power out of these.

Put an aluminum flywheel, exhaust, intake, 22mm mikuni carb, billet con rod, increase compression with 14cc head, put 36lb valve springs (not 18lb because according to what kind of power you want), 1:2 or 1:3 rockers, chromoly pushrods, and a Black Mamba cam tell me that engine is not plenty of a beast. (parts suggested are for gx200/clone/predator)
  #28  
Old 03-05-2013, 10:00 AM
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Yes but you forget that can't run on pump gas. And it's still carbed.


It's an internal wastegate, piping is the same as any other exhaust, oil pump is not heavy (small).


This is not going to be a light kart by any means. Electric start, battery, electronics, engine it self is almost 80 pounds.


A 420cc motor will be able to spool the turbo without a doubt and it'll make as much power as I allow it. I'm guessing the wastegate is a 1-5psi spring. I have a boost controller laying around ill turn it up or disconnect it all together.
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Old 03-07-2013, 01:01 PM
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It's your money you can waste it how you want, but I'm telling you now you'll wish you had listened. I've talked to small engine builders who personally have and they agree it is not worth the money. The engine itself is more than 80lbs I owned one and shipped it they weigh 96lbs with box so around 93-94lbs.
  #30  
Old 03-07-2013, 01:26 PM
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I guarantee without a doubt I will make at least 5psi by 5000 rpm and at 9:1 or 10:1 on e85 can easily reach 45hp.

But hey. This is why I'm trying it if it works, sweet. If it doesn't, nothing a quick cam and head change and I cam make 45hp all motor.




You forget a 490cc motor is quite big and has a huge stroke. That's a lot of air. A 400cc turbo bike (while more efficient with 4 cylinders typically) has no problem spooling a bigger turbo. But has more rpm yes sure. Same with snowmobiles and jet skis.
  #31  
Old 03-08-2013, 10:40 PM
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Hey man, first let me applaud you for trying something new and staying with it despite having the stalwarts on this site try to stop you.

I can tell you I too am an import jdm enthusiasts. I remember a time when closed minded individuals told me my d16a6 in my crx wouldn't amount to anything and I should "junk it" for the forever dull b16.
Five years later- a d series engine will blow a b series out of the water and for half the price.
Lesson learned- dont give up. March forward and we will embrace turbo soon. Hopefully.
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  #32  
Old 03-09-2013, 06:35 AM
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  #33  
Old 03-09-2013, 07:48 AM
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As for electric start on the 212cc, ebay sells starters that say they bolt on for around $35.
  #34  
Old 04-30-2013, 08:23 PM
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hit a snag. well more like i need to decide what way i want to go with this.


i really am building this as a fun kart/drift kart. im worried a 390 size motor will be way too big/rear heavy and un balanced. and im also thinking a electric start is off the table

still need to figure out how to power the thing for fuel injection. might have to just run a battery that needs to be charged on a power source and i would have to switch them out.



still want to turbo it, may end up being for mostly show since i think a low compression 6hp clone will not move enough air to spool it well.






does anyone know if the exhaust port/flanges are the same for the small and big motors?
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