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-   -   Hemi vs non-Hemi 212cc (http://www.diygokarts.com/vb/showthread.php?t=39443)

Ragnar4077 06-21-2018 01:47 PM

Hemi vs non-Hemi 212cc
 
I have started this forum in order to answer a complex question.
The question is which engine is better. I am leaving it up to you user to answer the question:huh:

bob58o 06-21-2018 02:05 PM

Are you going to build it out, or just run it stock?
What are you plans?

gr8hairy1 06-21-2018 02:08 PM

http://www.diygokarts.com/vb/showthread.php?t=33302
http://www.diygokarts.com/vb/showthread.php?t=33302
https://www.oldminibikes.com/forum/m...i-vs-hemi.html

There is a difference, but it is not in a large difference. If you're looking at making many upgrades for each small barely perceptible increase in power, then yes, obviously the hemi will be the way to go. There are many parts available for both and not all are interchangeable.

The better question is what do you want to use the engine for?

65ShelbyClone 06-21-2018 02:39 PM

Quote:

Originally Posted by Ragnar4077 (Post 503057)
I have started this forum in order to answer a vague question. The question is which engine is better.

FTFY.

Vague answer: Possibly one of them. Depends on what you want to do with it.

Is Coke or Pepsi better? (hint: most answers will be wrong)

mckutzy 06-21-2018 03:06 PM

I'm going to say Ginger Beer.... The sharper the better...
Good times...

gr8hairy1 06-21-2018 03:44 PM

Mmmm ginger beer. You know it's good when you go to take a drink and it feels like it's going to burn your nose!

mckutzy 06-21-2018 04:38 PM

Dude.... when your gasping and tearing up like you took a good belt of high proof whiskey...
That's the stuff there... Really Clears the sinuses out......
Was thinking of getting into making my own... But it's alot of work to get good a good product... Already got a few projects on the go...

Mmmmm.... Good times...

.... Ah hem.... Yes.... 212....
I'm a Otar Rotaderp fan myself... Cause I can't get genuine derp brand up here... Non- that is...

bob58o 06-21-2018 06:40 PM

Well if you get the non-Hemi, what are you going to say when people ask???
https://www.youtube.com/watch?v=n0THMwP_MXE

Ragnar4077 06-21-2018 07:02 PM

I bought the hemi 2 years ago for my Murray gt60504x92a. All I have done is the stage 1 kit plus remove the governor, and I will probably leave it at that

anickode 06-21-2018 07:07 PM

The hemi is more widely supported for performance modding.

At stage 1 the difference is pretty much non-existent.

Ragnar4077 06-21-2018 07:50 PM

When I take off the side of the engine when I remove the governor, should I scrape off the old broken gasket, and then put the new one on? Thanks!

---------- Post added at 06:50 PM ---------- Previous post was at 06:37 PM ----------

And...... Is the $100 mikuni carb worth it?

bob58o 06-21-2018 07:50 PM

Quote:

Originally Posted by Ragnar4077 (Post 503087)
When I take off the side of the engine when I remove the governor, should I scrape off the old broken gasket, and then put the new one on? Thanks!

Well if the gasket is broken, then yes - scrape it off and replace it.

There is nothing I hate more than a torn gasket. I reuse them as long as they aren't too bad. I try to be extra careful when removing covers. I don't have replacements. I suck at cutting my own (plus the thickness of the side cover gasket is important for crankshaft endplay). I end up using RTV when I can, then have to redo it every time I need access. RTV is not recommended for the side cover, because the thickness determines crankshaft endplay.

So ya, scrape it off and replace it.:thumbsup:
If not broken, reuse it.

Ragnar4077 06-21-2018 07:53 PM

Thanks! Do you have any experience with $100 mikunis?

bob58o 06-21-2018 08:04 PM

Quote:

Originally Posted by Ragnar4077 (Post 503090)
Thanks! Do you have any experience with $100 mikunis?

Nope. I use $25 OKO Flat Slides. Knock offs of Keihin PWKs.

Ragnar4077 06-21-2018 08:08 PM

Interesting. I'm trying to find a carb better than the stock one, and it also eliminates the stock throttle.

bob58o 06-21-2018 08:18 PM

This GPS Manifold (doesn't have fitting for pulse pump)
https://www.gopowersports.com/manifo...ones-predators

This 24mm Carb...
https://www.ebay.com/itm/KOSO-OKO-PW...YAAOSwslRazW4Z

Jet kits are like $10 if you need to change the jetting.
https://www.google.com/search?q=oko+...hrome&ie=UTF-8

Air filters range from like $3 - $20.
https://www.google.com/search?q=48mm...hrome&ie=UTF-8

---------- Post added at 09:18 PM ---------- Previous post was at 09:17 PM ----------

Is this the $100 mikuni you were looking at?
Or $100 for just the carb?
https://www.gopowersports.com/22mm-m...rformance-kit/

Ragnar4077 06-21-2018 08:19 PM

Thanks so much!

bob58o 06-21-2018 08:25 PM

Here's a 22mm OKO, it say OKO21, but measures 22mm.
https://www.aliexpress.com/item/OKO2...ceBeautifyAB=0

https://www.aliexpress.com/item/OKO-...817053093.html

The carbs come from China most of the time. I use Aliexpress for the carbs often. They show up in less than two weeks usually.

BurninRubber 06-27-2018 01:17 PM

Here you go! https://en.wikipedia.org/wiki/Hemisp...ustion_chamber

65ShelbyClone 06-28-2018 11:40 AM

Ole4 on OMB flow tested a stock 212 hemi head against a stock inline 212 and the results were unimpressive. His results show only a marginal advantage with the Hemi. It looks like they are capable of more flow than the inline heads, but only when very heavily modified.

https://www.oldminibikes.com/forum/e...hemi-head.html
https://www.oldminibikes.com/forum/h...ad-rework.html

I think I know why: the hemi port seems to favor the short-side radius (SSR) and one side of the valve. Problem is that there is no SSR; it's just a sharp edge. Porting on inline heads often focuses on getting air to follow the roof and go over the valve because getting it to go around the SSR is a losing proposition. The hemi head has the valve angled so more if it is in the way of doing that.

Something else to keep in mind is that hemispherical chambers usually have little to no quench area. That makes them more octane-sensitive and is a consideration if the compression ratio will be increased.

The lack of quench makes them better suited to burning nitromethane. I doubt that anyone here is or will be using nitro though given all its difficulties and $50/gal average price.

This is probably all overkill information for the intent of the thread...


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