Charged K20a Prelude Type S

BMCC · Post by **BMCC** » Thu Jan 09, 2014 3:55 pm

It is the vacuum in the inlet manifold that opens the PCV valve so letting the crankcase breathe. The higher the vac the more it is open. You do though need to push some air round the crankcase in the first place which is why there is a connection on the intake before the throttle plate. It is this filtered air that pushes the crankcase vapours round and out of the PCV valve. I am not sure if a breather on the end of the rocker cover provides enough air. You could always clamp the return to the IM (at idle) and see if it makes a clicking sound (which is the way you test to see if the PCV is knackered) No click then there can't be any vapours coming out fo the valve.

Mudgey · Post by **Mudgey** » Thu Jan 09, 2014 4:16 pm

Ahh, this is where I am going wrong, the K20 engine doesnt use a vacuum operated valve!
After reading wikipedia I see that modern cars that run this system are calibrated to allow for a known amount of airflow through the crankcase.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Thu Jan 09, 2014 4:46 pm

It's quite possible to have a knackered head gasket that doesn't look knackered when you take it out - I've had that before.

That's some seriously long cam chain bearing pads on that engine!!! I'm only used to short blocks a couple of inches long from chain engines I've worked on

Post by **RattyMcClelland** » Thu Jan 09, 2014 5:03 pm

Your K20 PCV is the same as the H22.
The inlet of the PCV is via the air intake tubing into the rocker cover. There is no valve on this part. Its purley a tube that connect the air intake to the rocker cover. Air needs to be forced through this tube since it does not produce enough vacuum to warrant a standalone breather filter.

The outlet of the PCV is from the other side of the rocker cover and into the intake manifold/supercharger or catchcan. This does have a 1 way valve that can only go one way from the rocker to the intake manifold. The ball bearing inside wont let air flow through from the intake manifold to the rocker.

Cant believe how quickly you work. Just whipped out the engine and stripped it. Puts us to shame.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Thu Jan 09, 2014 6:53 pm

Mr PCV wrote: Cant believe how quickly you work. Just whipped out the engine and stripped it. Puts us to shame.

Agreed.

It does help when you've had the thing in/out numerous times though, so you know exactly how everything works, comes apart and goes back together, including all torque settings straight off the top of your head, no faffing about checking manuals and scratching head etc. and when you KNOW everything WILL come apart with no bother etc. It's a great motivator. I got head gasket changes on an ex's Nissan Sunny down below 2 hours (running car to running car again), on my own.

(I'm assuming Mudgey's in that position anyway, with the amount he's done and re-done to the car!)

Mudgey · Post by **Mudgey** » Sun Feb 09, 2014 4:10 pm

Haha, yea the engines been in/out a stupid number of times, I know everything inside and out and could probably do it with my eyes closed!

So ive not done much recently but we managed to blast through a bit this week and got a few bits done:

1, Power steering high pressure and return lines done, used one of the original Lude lines and the routing has been kept extremely neat and tidy.
2. Valve clearences done.
3. Engine/Box back together.
4. Supercharger Back on.
5. Engine back in car & started to fit new engine mounts and other bits back on.

Last engine mount to make is the very front one which I am working on now.

These 3D printers come in pretty handy, atm its printing out a template so I can check my hole positionings for the front engine mount.

Had to modify my PS bracket

My new daily until the prelude is functioning 100% & just incase anyone mentions it, I do have the original plate to go on but can't get the fixings until Monday.
The plan is to keep this one completely original and just tidy it up a bit, there are a few little things to touch up but despite doing 92k its in really good condition! Everything works faultlessly and it seems to have been maintained to a good standard.

mercutio · Post by **mercutio** » Sun Feb 09, 2014 7:42 pm

oooh 3d printing in the world of ludes

Post by **NafemanNathan** » Sun Feb 09, 2014 10:43 pm

3D printing is certainly the future. I've had a few things 3D printed now... Sadly for work, not the lude

but it's still cool

Did you build the printer yourself?

And nice Teg... Especially considering it's a temp

lol

Mudgey · Post by **Mudgey** » Mon Feb 10, 2014 10:42 am

Yea the printer is a pretty good device, i've used it quite extensively for prototyping parts at work, checking clearances and most importantly engine mounts for the Lude, don't worry they will be made of metal. I'm dreaming of the days a metal based printer is affordable enough that I could print out a mount and simply bolt it up!

I didnt build it, its a Flashforge unit, a budget end version but still very capable!

Post by **NafemanNathan** » Mon Feb 10, 2014 10:54 am

I've been and done the tour around 3T RPD. I've got some funky otherwise impossible to make samples right in front of me now actually!

It's amazing what can be made! They're developing new metals that can be sintered all the time to. Sadly their cheapest, smallest nylon printing machine is in excess of £250,000 and I think their smallest metal printer was in excess of £500,000

... I'll hold out high hopes for your business though

Lude Generation

Charged K20a Prelude Type S

Re: Charged K20a Prelude Type S

Re: Charged K20a Prelude Type S

Re: Charged K20a Prelude Type S