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K20 Rotrex'd C38-91 Pug 106

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184K views 352 replies 48 participants last post by  Juanlu_rb25  
#1 · (Edited)
K20 Rotrex/sequential/dry sump'd Pug 106

Hello guys, I've started my k20 pug 106 project now. In the next few months things should start to shape up nicely.

The main goal of my car is to make it as fast as possible for the money I have. There are no restrictions like there would be in some race series cars.

The general goal is to get the weight down to around 800kgs (roughly 1750lbs) and for the engine to produce around 450hp.
This project is by no means all about power, there will be a proper roll cage installed, digital dash, widetrack suspension, remote reservoir dampers and some nice brakes.

Here are a few taster pictures for now while I get some proper progress together..


Here's how it started

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Designed and machined my own mounts (k-swap mounts would hit my chassis)

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Add this into the mix and things get interesting ;)

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Add these things get more interesting :)

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Lots more things happening including tilton pedal box and chassis work.

I'll keep it updated, this will be pretty nasty ;)
 
#221 · (Edited)
The duct work on the hood is fabulous. Id love to see an under hood shot for some more detail.

You definitely shoe horned the swap in there. Every millimeter is purposefully accounted for. Nothing but love and admiration for your work here!

I cant imagine an air bubble staying trapped in high RPM forced coolant. Maybe a steam pocket? Maybe its an issue with the sensors location? Has anyone tried using water wetter (a coolant additive)? There has been debate in the past about the best location for the coolant sensor...

@Dan : You said you couldnt use the stock plastic housing... is the outlet clocked the wrong way? You might can use the outlet from another Honda K series model as some are clocked differently?
 
#237 ·
Cheers mate ^^^ :)


One for the rotrex guys...
I'm sure most of you have read through Jaydee's thread on rotrex engines..he mentions the importance of using a manual override system for the belt tension... Now I don't have ANY space in that area at all so that got me thinking.. I'm going to try and modify my k-tuned billet idler pulley so it can house a manual adjuster to put extra tension on the belt..
If I get a boss machined up that sits inside the k-tuned idler bracket then run a bolt through the top of it to push/pull the machined boss up and down.. Potentially a very simple fix that is nicely packaged.
 
#238 ·
Sounds like a good solution. Try and rubber mount one end if possible to give you a visual idea of the tension without getting out the tension gauge. It also softens some of the shock loadings during transients.
see post #3.
http://www.k20a.org/forum/showthread.php?t=163201

I love your car almost as much as mine! Cheers Dan
 
#239 ·
I'll see if I can incorporate it into the setup. I have a good idea that should work.
It's the only realistic way I can install a manual override with the space I've got.

I've got another potential problem, because of the lack of space I have to use the oem TPS... But the engine is pretty much solid..so I'm not expecting it to last very long.. I've got an idea where I will cut off the flange off the excessive plenum and rotate it then weld it back on.. Then I can use a k-tuned Hall effect.

Fingers crossed I'll have a loom to fit to the car soon, then hopefully startup not long after
 
#244 ·
Yes, I should have some decent pics the weekend but my wiring loom is very nearly complete!! The quality is stunning!

The whole loom has been made with Rachem 44/55 wire with Rachem heat shrink and proper boots, it's all labelled too etc.. I've already had the chassis loom and it's in the car.. I will soon be ready for it's first start :)

Got a lot of little jobs to do then it will be off for mapping.
 
#248 ·
I've got a few friends with k20 swap cars and they have all had problems so I'll sort it because I don't want it to ever be an issue. I don't want to be at the 'ring and parts fail on me. Plus the mounts I'm using are HARD... I can't even move the engine by rocking it with my hands.. It moves the car/suspension haha