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  #21  
Old 11-08-2012, 12:10 AM
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Waddaya mean "almost"
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  #22  
Old 11-09-2012, 02:01 AM
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Who can tell me the difference between a GX140 head & a GX160 head? I'm not too concerned about the size of the combustion chamber, valve size & bolt alignment are the main issues
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Old 11-09-2012, 02:47 AM
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Quote:
Originally Posted by Fabroman View Post
Who can tell me the difference between a GX140 head & a GX160 head? I'm not too concerned about the size of the combustion chamber, valve size & bolt alignment are the main issues
I know R_chez has mentioned what the difference is, but I cannot for the life of me remember what it was. PM him
  #24  
Old 11-09-2012, 07:14 PM
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I would if he'd empty his inbox!

Paging r_chez...
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Old 11-12-2012, 04:02 AM
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I would if he'd empty his inbox!

Paging r_chez...
I am so stupid. I thought "let me PM r_chez for Fabroman", and then halfway through my PM I went.....DOH
  #26  
Old 11-19-2012, 08:07 PM
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Originally Posted by landuse View Post
I am so stupid. I thought "let me PM r_chez for Fabroman", and then halfway through my PM I went.....DOH
Duh!

Anyhoo, here's the reason I asked in the first place (see pics):

After examining both heads, I can tell you the 160 has bigger valves & ports than the 140. Everything else (guides, stud pattern, overall size) is identical. Thanks chez

I'm currently examining which road would be easier (& cheaper) to take; weld up the 160 head or mod the 140 head to suit.
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SDC10578.jpg   SDC10579.jpg  

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Old 11-19-2012, 11:59 PM
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If you can mod the 140, it might be eisier. It looks like you are not going to be able to fix that exhaust bolt hole. It looks like it has been fixed before
  #28  
Old 11-20-2012, 12:22 AM
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That's what I'm thinking. With any luck, it won't be too difficult to mod.
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  #29  
Old 11-20-2012, 01:01 AM
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Quote:
Originally Posted by Fabroman View Post
That's what I'm thinking. With any luck, it won't be too difficult to mod.
So how are you planning to make the ports larger. A dremel type tool?
  #30  
Old 11-20-2012, 01:19 AM
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Yep, if I can. I have to find out how much meat is behind them first; hopefully, lots
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  #31  
Old 11-20-2012, 10:07 AM
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Ok, can someone please explain this to me:

I just had both heads side by side to confirm the aforementioned differences between the two. Then I looked at both carbs & their spacers & found they're identical?

So, on the smaller engine you have a carb which then goes to a spacer/adapter which goes from the shape of the carb throat to the shape & size of the port. On the larger engine, the same applies until you get to the port which is 1/8" larger than the spacer. The port then tapers down to be approximately the same size on both heads.

Now, if I understand the concept correctly (which I think I do), the increased size of the port compared to the spacer would cause a loss of velocity as the fuel enters the port &, worst case, create a vortex which would slow the fuel dramatically, correct? Yes, it would pick up again as it travels through the port but, wouldn't it be more efficient if there was no loss at all?

Basically, what I'm asking is, wouldn't I be better off with the smaller port anyway?

Pic legend: Pics 1 & 3; 140 are on the left. Pics 2, 4, 5 & 6 140 are on the right.
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SDC10580.jpg   SDC10581.jpg  

SDC10582.jpg   SDC10585.jpg  

SDC10586.jpg   SDC10587.jpg  

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  #32  
Old 11-20-2012, 11:25 AM
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I'd pm the guy who started the porting thread, its in the engine sticky's. He should be able to help you since he does porting professorially.
  #33  
Old 11-20-2012, 03:47 PM
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Roger that!
I could empty my inbox but thats an effort!
Pretty sure the 140 head has smaller ports. The 120 definently does.
Think its still a 14cc head tho.
Edit: haha oops, sorry for trying to have a life guys
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  #34  
Old 11-20-2012, 04:14 PM
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Quote:
Originally Posted by exenos View Post
I'd pm the guy who started the porting thread, its in the engine sticky's. He should be able to help you since he does porting professorially.
Did that yesterday awaiting reply

Quote:
Originally Posted by r_chez_08 View Post
Roger that!
I could empty my inbox but thats an effort!
Pretty sure the 140 head has smaller ports. The 120 definently does.
Think its still a 14cc head tho.
Edit: haha oops, sorry for trying to have a life guys
Finally, I tried to PM you a week ago!

That's what I'm saying, the combustion chambers are the same, the head overall is the same, the only difference is the ports & valves. Everywhere I search I get the same result; 140, 160 & 200 all use the same carb. Oh, here's another weird thing, the 140 carb has a bigger jet
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  #35  
Old 11-20-2012, 04:36 PM
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The 160 carb is smaller. Pretty sure 140 carb is the same.
Tbh though, honda changed there designs numerous times so it is hard to give exact specs.
If you have a 160 head, use it. If not, open up the 140 head. Also some valve deshrouding may help.
Use the thinnest head gasket you can for reassembly, maintaining a .025 piston to head clearance. You could skim the head with some wet and dry and some glass too if you wanted.
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  #36  
Old 11-20-2012, 04:46 PM
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Quote:
Originally Posted by r_chez_08 View Post
If you have a 160 head, use it. If not, open up the 140 head.
Did you see post #26?

Quote:
Originally Posted by r_chez_08 View Post
Also some valve deshrouding may help.
Use the thinnest head gasket you can for reassembly, maintaining a .025 piston to head clearance. You could skim the head with some wet and dry and some glass too if you wanted.
My plan was to reseat the valves, skim/true the head & a bit of mild port work.
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  #37  
Old 11-21-2012, 12:47 AM
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Sorry, just skimmed the thread.
Jb weld to fix the exhaust stud? Or maybe drill is a little deeper and re tap as well as jb weld? Providing it wouldnt go through.
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  #38  
Old 11-21-2012, 02:06 AM
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devcon the **** outta that hole
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  #39  
Old 11-21-2012, 08:03 AM
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Quote:
Originally Posted by r_chez_08 View Post
Sorry, just skimmed the thread.
Jb weld to fix the exhaust stud? Or maybe drill is a little deeper and re tap as well as jb weld? Providing it wouldnt go through.
Quote:
Originally Posted by fowler View Post
devcon the **** outta that hole
I thought of that but, first I have to remove what's left of the old stud; I'm having a hard enough time trying to remove the good ones.

I even thought of having it welded properly. then I'd have to redrill the hole, tap it & file it.

Still waitiing for a response from ammfab about the ports
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  #40  
Old 11-21-2012, 10:31 AM
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Hey fabroman, just thought-
I have a good quality 160 14cc clone head, i could do a good deal on. Would save you some hassle.
You interested?
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