L28 rebuild

[Ejkej]

I want to share with you with some pictures from my engine rebuild It is a N42/N42 combo.

 

valve seats

 

valves

 

chamber cc-ing

 

new camshaft sprocket

 

new camshaft 276/276 duration 8mm/8mm lobe lift

 

head and camshaft installed - notice that the sprocket has been reworked to allow adjustment

 

engine almost assembled

 

from the front - You can see EDIS wheel and trigger and subaru power steering pump installed

 

Head chamber have been polished, intake/exhaust bored and polished, valve guides replaced.

Bottom of the engine has been drilled +0.5mm with new ITM flattops, crank polished and checked for straight. Estimated CR 10:1-10,5:1.

 

Thanks for all the help I got from You!

[BluDestiny]

What kind of throttle bodies are those?

 

And I was wondering what that thing was that is in the location of the AC compressor. What are you going to do about the rack?

[Ejkej]

Those ITBs are custom built by Hybridz user - Z-ya. It is a combination of EFI flange/SU intake/280zx TBs. The process of building was described some time ago.

The "thing" in place of A/C is a power steering pump from subaru, it will work with subaru rack:

Edited April 3, 2012 by Ejkej

[BluDestiny]

Yeah I rememeber Z-ya selling his setup.

 

The second part was more of an observation, I got that it was a PS pump.

 

I never thought the subaru steering rack would fit, but I've never measured.

 

What are you're plans for the car? or what class will you be running in?

[Ejkej]

I did the rack swap following instructions I have found here on Hybridz, for example here is an interesting link:

http://forums.hybridz.org/index.php/topic/46504-lt1-and-subaru-rack/

 

Apart from having PS and probably quicker response it is very important for me to be able to use subaru outer tie rods, which are available here.

 

As for my plans - I plan to start in amateur racing events - something between race and auto_X. They take place on racetracks, old aeroplane landing zones.

I posted this video earlier but it will give You the general idea of those events:

http://www.youtube.com./watch?v=PPEqDOYPDTI

 

Thanks

[duragg]

Looks great.

 

When I saw your adjustible cam sprocket I wonder if those screws should be drilled for safety wire.

 

You could even drill the cam sprocket bolt in 4 places so the 4 screws would be locked by the cam bolt which would likewise be locked by the 4 screws.

When I built my F54/N42 I got lucky and found my cam bolt loose after about 10 hours of use.

 

Power target?

[Ejkej]

Thanks for the tip on screws. I am planning to tighten them using Loctite once everything will be dynoed and calibrated. It should be enough...

 

As for the power goals... I am not sure how high the numbers will be. Last year I dynoed the engine in its stock specification and it showed 151 HP/155 ft lbs measured on the engine. The compression was ca 130 PSI on all 6. The guy who did the maths for my setup estimates the power at 215-220 HP, anyway it will be an improvement

 

Here You can see the dyno chart from last year:

 

Thanks,

Andrzej

[duragg]

My similar setup got almost 200 at the wheels.

I dig those TBs.

 

You put in a Wideband?

[Ejkej]

Heh, 200 HP on the wheels? I can only imagine how fun it is to drive!

As for the wideband - I plan to use narrow O2, however for setting the engine up on a dyno the wideband will be used.

I liked those ITBs from the first time I saw them... and now they fit my Frankenstein engine very well

 

Yesterday I measured the compression on cold engine, just cranking it - 180 PSI on all 6.

[Stunt]

Nice build. I also have a n42/n42 combo. I plan on rebuilding it from the ground up. You just gave me some inspiration. How much did your rebuild cost you? And what parts did you use?