Forums
New posts
Search forums
What's new
New posts
New profile posts
Latest activity
Members
Registered members
Current visitors
New profile posts
Search profile posts
Donations
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
General Minitrail Talk
Projects/Builds
Hk1 yellow fever
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
.
Reply to thread
Message
<blockquote data-quote="69ST" data-source="post: 164332" data-attributes="member: 5"><p>Not enough time, mileage and sustained high-speed cruising to get any kind of handle on what it'll do under heavy load. Things change rapidly as speed increases. Power requirements increase dramatically above 50mph and that's where peak temps will spike. It's unlikely that you could run lean enough at 40mph to do damage, unless it's ascending long, steep, grades. However, increasing speed from 50mph to 60mph (for example) requires 60% more hp...that's where combustion chamber temps can run amok :flame:</p><p></p><p>At moderate speeds, under light load, you can easily get by with A:F ratios as lean as ~15:1. Under closed-throttle deceleration, ~16.1. At other end of the spectrum, WOT, ideal numbers are in the mid-to-high 12s. They'll go into rich misfire anywhere between 12.4-12.7:1, depending upon the fuel, and specific engine combo. That's rich enough to foul plugs, at low speed. Under full power, that extra fuel keeps temps under control. It also strengthens throttle response, on the way up.</p><p></p><p>Get out on the road, where 55mph can be sustained for miles at a shot, and then you'll find out how well the setup is balanced. IMO, this motor needs a lot more break-in mileage before being pushed that hard. This includes a full-on dyno workout. You're still dealing with frictional heating and a flood of metallic particles being shed from new parts.</p></blockquote><p></p>
[QUOTE="69ST, post: 164332, member: 5"] Not enough time, mileage and sustained high-speed cruising to get any kind of handle on what it'll do under heavy load. Things change rapidly as speed increases. Power requirements increase dramatically above 50mph and that's where peak temps will spike. It's unlikely that you could run lean enough at 40mph to do damage, unless it's ascending long, steep, grades. However, increasing speed from 50mph to 60mph (for example) requires 60% more hp...that's where combustion chamber temps can run amok :flame: At moderate speeds, under light load, you can easily get by with A:F ratios as lean as ~15:1. Under closed-throttle deceleration, ~16.1. At other end of the spectrum, WOT, ideal numbers are in the mid-to-high 12s. They'll go into rich misfire anywhere between 12.4-12.7:1, depending upon the fuel, and specific engine combo. That's rich enough to foul plugs, at low speed. Under full power, that extra fuel keeps temps under control. It also strengthens throttle response, on the way up. Get out on the road, where 55mph can be sustained for miles at a shot, and then you'll find out how well the setup is balanced. IMO, this motor needs a lot more break-in mileage before being pushed that hard. This includes a full-on dyno workout. You're still dealing with frictional heating and a flood of metallic particles being shed from new parts. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
General Minitrail Talk
Projects/Builds
Hk1 yellow fever
Top