2056 L - Jet Build advise request Options

[pnewman]

Time to rebuild my stock 1.8 L Jet

Keeping the L Jet.

Any recommendations with the 2056 build in regards to the L Jet
-such as cam choice and source etc.
-do's / don'ts from your experience.
-links to like build threads.

Thanks in advance.
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[r_towle]

What is the difference is head flow between the stock heads and the RS heads?

Curious how much change is occurring....

[Jake Raby]

What is the difference is head flow between the stock heads and the RS heads?

Curious how much change is occurring....

On a 2056, about 15HP worth of difference back to back.

On the flow bench the peak flow is very similar, but where the flow peaks at is different and low lift flow and chamber filling is dramatically increased.

The biggest difference is the altered port flow margins between intake and exhaust ports. Remember, peak flow mans a lot less than where the flow is made and what intake : exhaust flow margins are.

These port flow margins work really well with the split duration cams that I developed as part of many engine combinations.

Here's a graph that was handy from the 2006 offerings, the RS is more refined now than this, but this is the general idea. Remember, this is dry flow data and doesn't show swirl, or tumble, or port velocity. But we have all that data as well.
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.aircooledtechnology.com-1095-1415941456.1.jpg)

This post has been edited by Jake Raby: Nov 13 2014, 11:04 PM

[HAM Inc]

What is the difference is head flow between the stock heads and the RS heads?

Curious how much change is occurring....

On a 2056, about 15HP worth of difference back to back.

On the flow bench the peak flow is very similar, but where the flow peaks at is different and low lift flow and chamber filling is dramatically increased.

The biggest difference is the altered port flow margins between intake and exhaust ports. Remember, peak flow mans a lot less than where the flow is made and what intake : exhaust flow margins are.

These port flow margins work really well with the split duration cams that I developed as part of many engine combinations.

Here's a graph that was handy from the 2006 offerings, the RS is more refined now than this, but this is the general idea. Remember, this is dry flow data and doesn't show swirl, or tumble, or port velocity. But we have all that data as well.
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.aircooledtechnology.com-1095-1415941456.1.jpg)

That's flow data from two generations ago. We blew past that a while ago. We no longer put flow data out for public consumption, but let's just say that the current version of the RS+ is substantially more potent. That data was from the transition version when the RS+ superseded the LE-180.
Here's a link to our facebook page with pics of the latest RS+
https://www.facebook.com/HoffmanAutomotiveMachine?ref=br_rs
Our latest heads with the upgraded cam offerings will make for an even stouter power-plant than even just a few years ago.

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