Forums
New posts
Search forums
What's new
New posts
New media
New media comments
Latest activity
Classifieds
Media
New media
New comments
Search media
Log in
Register
What's New?
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Navigation
Install the app
Install
More Options
Advertise with us
Contact Us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
The Water Cooler
General Discussion
Where to buy an engine? builder reviews? opnions?
Search titles only
By:
Reply to Thread
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="MoBoost" data-source="post: 1843535" data-attributes="member: 3455"><p>Different designs have different geometric lift limitations:</p><p></p><p>OHC bucket - the diameter of the bucket</p><p></p><p>OHC follower/rocker - distance from cam axis to rocker axis, some designs have plenty of room at the expense of packaging - have you seen how wide Ford cammer is?</p><p></p><p>OHV pushrod - size of cam bearing, but since rocker ratio is independent the lift is very flexible.</p><p></p><p></p><p>As far as valve train weight - it's supported by the "strength" of the valve spring - they've gotten very good at it. In all honesty - before the mass production of cathedral port design - everyday pushrod engines were not much to write home about (obviously now they got square and rec. ports that are even better).</p><p></p><p>No doubt, OHC is more efficient design, but only when capitalized on its benefits - 4 (or 5) valves per cylinder, high efficiency head design, bottom end designed to utilize the first two. And you don't have to fantasize about Formula1 to see it in action - just look at modern liter bikes.</p></blockquote><p></p>
[QUOTE="MoBoost, post: 1843535, member: 3455"] Different designs have different geometric lift limitations: OHC bucket - the diameter of the bucket OHC follower/rocker - distance from cam axis to rocker axis, some designs have plenty of room at the expense of packaging - have you seen how wide Ford cammer is? OHV pushrod - size of cam bearing, but since rocker ratio is independent the lift is very flexible. As far as valve train weight - it's supported by the "strength" of the valve spring - they've gotten very good at it. In all honesty - before the mass production of cathedral port design - everyday pushrod engines were not much to write home about (obviously now they got square and rec. ports that are even better). No doubt, OHC is more efficient design, but only when capitalized on its benefits - 4 (or 5) valves per cylinder, high efficiency head design, bottom end designed to utilize the first two. And you don't have to fantasize about Formula1 to see it in action - just look at modern liter bikes. [/QUOTE]
Insert Quotes…
Verification
Post Reply
Forums
The Water Cooler
General Discussion
Where to buy an engine? builder reviews? opnions?
Search titles only
By:
Top
Bottom