Hemi vs non-Hemi 212cc

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Ragnar4077

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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:
 
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gr8hairy1

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http://www.diygokarts.com/vb/showthread.php?t=33302
http://www.diygokarts.com/vb/showthread.php?t=33302
https://www.oldminibikes.com/forum/mini-bike-discussion/134623-predator-hemi-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

65ShelbyClone

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Ragnar4077 said:
I have started this forum in order to answer a vague question. The question is which engine is better.
Click to expand...

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)
 
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mckutzy

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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...
 
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Ragnar4077

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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

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The hemi is more widely supported for performance modding.

At stage 1 the difference is pretty much non-existent.
 
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Ragnar4077

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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

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Ragnar4077 said:
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!
Click to expand...

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.
 
bob58o

bob58o

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This GPS Manifold (doesn't have fitting for pulse pump)
https://www.gopowersports.com/manifold-for-6-5hp-clones-predators

This 24mm Carb...
https://www.ebay.com/itm/KOSO-OKO-P...030642&hash=item3f9584a706:g:tTYAAOSwslRazW4Z

Jet kits are like $10 if you need to change the jetting.
https://www.google.com/search?q=oko...rome..69i57.3109j1j4&sourceid=chrome&ie=UTF-8

Air filters range from like $3 - $20.
https://www.google.com/search?q=48m...1j35i39j0l3.2779j1j9&sourceid=chrome&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-mikuni-carburetor-performance-kit/
 
65ShelbyClone

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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/engines-and-modifications/86535-flowing-hemi-head.html
https://www.oldminibikes.com/forum/honda-clone-predator/118120-hemi-head-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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