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 Post subject: 150cc 4v head pros/cons?
PostPosted: Tue Mar 28, 2017 8:11 am 
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Location: Blountstown,FL
A buddy of mine is interested in getting a 4v head and was wondering what the pros and cons are. His build atm is 61mm bbk 2.xx stroker big port head a12 camshaft uni and perf exaust.


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 Post subject: Re: 150cc 4v head pros/cons?
PostPosted: Tue Mar 28, 2017 9:31 am 
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Location: Elburn Il.
BEEFKING69 wrote:
A buddy of mine is interested in getting a 4v head and was wondering what the pros and cons are. His build atm is 61mm bbk 2.xx stroker big port head a12 camshaft uni and perf exaust.

You will have alot of power
The cost is high

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 Post subject: Re: 150cc 4v head pros/cons?
PostPosted: Tue Mar 28, 2017 10:29 am 
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Other than cost, the only other cons are that you have to replace the cam chain with a different length and the 4-head valves do not have a selection of cam grinds to choose from like the 2-valve.

The 4-valve head should give you a great performance boost and even better if you get it ported and polished. To see the difference in 4-valve verses 2-valve efficiency, compare the Chery 4-valve with the Suzuki 2-valve motors in the larger buggies.

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 Post subject: Re: 150cc 4v head pros/cons?
PostPosted: Tue Mar 28, 2017 10:59 am 
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Ok sounds fine to me. Do the shrouds have to be modified? I know the exhaust header will have to be right?


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 Post subject: Re: 150cc 4v head pros/cons?
PostPosted: Tue Mar 28, 2017 11:12 am 
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Yes to both but slightly.
The power you get is worth it

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Karl



Blade DX 150*
* on the juice for sale
HH 250ss
Quiksilver sr 440(went to a good home)
Joyner 650 SS
Red and black Redline Riots


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 Post subject: Re: 150cc 4v head pros/cons?
PostPosted: Tue Mar 28, 2017 11:13 am 
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Btw
What buggy?

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Karl



Blade DX 150*
* on the juice for sale
HH 250ss
Quiksilver sr 440(went to a good home)
Joyner 650 SS
Red and black Redline Riots


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 Post subject: Re: 150cc 4v head pros/cons?
PostPosted: Tue Mar 28, 2017 3:00 pm 
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Location: Blountstown,FL
Crossfire 150. its got a hammerhead motor with aftermarket oilcooler plus the stuff listed earlier.


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 Post subject: Re: 150cc 4v head pros/cons?
PostPosted: Tue Mar 28, 2017 4:00 pm 
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Sounds like Chucko old buggy

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Karl



Blade DX 150*
* on the juice for sale
HH 250ss
Quiksilver sr 440(went to a good home)
Joyner 650 SS
Red and black Redline Riots


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 Post subject: Re: 150cc 4v head pros/cons?
PostPosted: Tue Mar 28, 2017 4:06 pm 
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You might need a 4v piston too depending on the deck height

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Karl



Blade DX 150*
* on the juice for sale
HH 250ss
Quiksilver sr 440(went to a good home)
Joyner 650 SS
Red and black Redline Riots


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 Post subject: Re: 150cc 4v head pros/cons?
PostPosted: Wed Mar 29, 2017 7:16 pm 
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We was planning on getting a 4v piston anyway if we go this route


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 Post subject: Re: 150cc 4v head pros/cons?
PostPosted: Thu May 18, 2017 12:25 pm 
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Wish there was a comparison of a 2 valve head, ported, with a choice of cam, and the 4 valve ported with the cam they provide to see the difference.


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 Post subject: Re: 150cc 4v head pros/cons?
PostPosted: Sat May 20, 2017 11:46 pm 
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I still run the 2 valve head. my buggy is fast but the start off power is a little sluggish which is where the power gain is with the 4 valve head. I just haven't justified needing that low end power burst yet.

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