OHV or OHC?

Dragon · 05-05-2008, 11:23 PM

My Hi-Bird engine has two caps on the valve cover: one in the front and one in the back. Doesn't that make it an OHV engine?

DirtRoadKing · 05-05-2008, 11:27 PM

That would make it an over head cam, OHC!

CRidin · 05-05-2008, 11:52 PM

Valves are up there too.

TeamCheap · 05-06-2008, 05:05 AM

Over Head Camshaft engines are easy to spot.
Look for the round or roundish cover near the top of the engine on the left side.

The pushrod engines we have just have one large cover on the top of the cylinder head that needs to be removed to adjust the valves.

05-06-2008, 12:00 PM

when my motor gives up the ghost, I will try to replace with a OHC motor IF i can get it to bolt in.

IronFist · 05-06-2008, 02:25 PM

8O Great Pictures T/C 8O
Great for the Tech Info section!
I knew the difference but had never seen it so clearly put. Thank-you!

alonzo · 05-06-2008, 11:35 PM

My curosity has piqued. Has anyone got any specs or blue prints for the ohcs' rocker arms? As I sit back nursing my amber bock I am pondering the thought that since there is very little options of changing the cam shaft, that there might be a possaability that I might change the profile, "lift" of the cam by altering the fulcrum point of the rockers. What is the pros take on the thought? :idea:

TeamCheap · 05-07-2008, 01:19 PM

Quote:

Originally Posted by alonzo

My curosity has piqued. Has anyone got any specs or blue prints for the ohcs' rocker arms? As I sit back nursing my amber bock I am pondering the thought that since there is very little options of changing the cam shaft, that there might be a possaability that I might change the profile, "lift" of the cam by altering the fulcrum point of the rockers. What is the pros take on the thought? :idea:

I think it would be easier to find a similar cam with different valve timing or have one made.

But it all goes back to "just how much can these engines take".

Without having all of the needed tools/equipment I just dont think we're going to come up with anything that will change what these engines are.

I guess I'll just be happy with the simple mods I made and the performance increase I have gottten and start saving for a 400. :wink:

red2003 · 05-07-2008, 01:39 PM

I am sure you COULD have different ratio rockers made, but at a significant cost. A higher lift would kinda defeat the purpose of a dual sport as it would raise the peak HP to a higher RPM and you'd lose some low end torque in the process. If you were gonna throw a bigger carb, bigger valves, ported head, advanced timing, open pipe, etc at it and keep it near 10,000 rpm all teh time, then it'd be worth the money. But, you'd have more $$ in it then it cost to buy the bike, AND a less reliable engine in the process. Sorry to sound cynical.........

TeamCheap · 05-07-2008, 05:29 PM

These engines beg for the KISS system, Keep It Simple Stupid.

05-05-2008, 11:23 PM	#1
Dragon Join Date: Nov 2007 Location: Tejas Posts: 834	OHV or OHC? My Hi-Bird engine has two caps on the valve cover: one in the front and one in the back. Doesn't that make it an OHV engine?
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05-06-2008, 11:35 PM	#7
alonzo Join Date: May 2008 Posts: 527	My curosity has piqued. Has anyone got any specs or blue prints for the ohcs' rocker arms? As I sit back nursing my amber bock I am pondering the thought that since there is very little options of changing the cam shaft, that there might be a possaability that I might change the profile, "lift" of the cam by altering the fulcrum point of the rockers. What is the pros take on the thought? :idea: __________________ ALONZO 2007 Lifan a.k.a lucy lu. 2,000 miles of good riding.
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05-07-2008, 01:39 PM	#9
red2003 Join Date: Jan 2007 Location: Northern Vermont, USA Posts: 1,271	I am sure you COULD have different ratio rockers made, but at a significant cost. A higher lift would kinda defeat the purpose of a dual sport as it would raise the peak HP to a higher RPM and you'd lose some low end torque in the process. If you were gonna throw a bigger carb, bigger valves, ported head, advanced timing, open pipe, etc at it and keep it near 10,000 rpm all teh time, then it'd be worth the money. But, you'd have more $$ in it then it cost to buy the bike, AND a less reliable engine in the process. Sorry to sound cynical......... __________________ First Chinabike: 2006 Roketa RSX200E Current Chinabikes: 2023 Titan DLX & 2022 Lifan KP Mini w/ 210cc BRT kit, 22 RWHP!
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05-05-2008, 11:27 PM	#2
DirtRoadKing Join Date: Mar 2008 Location: Florida Posts: 146	That would make it an over head cam, OHC!
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05-05-2008, 11:52 PM	#3
CRidin Join Date: Apr 2008 Posts: 181	Valves are up there too.
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05-06-2008, 05:05 AM	#4
TeamCheap Join Date: Jun 2006 Location: directly under the earths sun............NOW Posts: 2,302	Over Head Camshaft engines are easy to spot. Look for the round or roundish cover near the top of the engine on the left side. The pushrod engines we have just have one large cover on the top of the cylinder head that needs to be removed to adjust the valves.
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05-06-2008, 12:00 PM	#5
Guest Posts: n/a	when my motor gives up the ghost, I will try to replace with a OHC motor IF i can get it to bolt in.
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05-06-2008, 02:25 PM	#6
IronFist Join Date: Apr 2007 Location: Toronto Ontario Canada Posts: 2,585	8O Great Pictures T/C 8O Great for the Tech Info section! I knew the difference but had never seen it so clearly put. Thank-you!
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05-07-2008, 05:29 PM	#10
TeamCheap Join Date: Jun 2006 Location: directly under the earths sun............NOW Posts: 2,302	These engines beg for the KISS system, Keep It Simple Stupid.
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