E88 head on an N42 block

[madkaw]

What timing are you running? Wouldn't a set of triples do you better also?

[madkaw]

Your signature says Megasquirt with that motor ?

[ozconnection]

What timing are you running? Wouldn't a set of triples do you better also?

Perhaps, but atm I'm finding that the Clifford and the Throttle body can support over 200 rwhp from an L28. This isn't an L31 we're talkin about here. The induction was an evolutionary step beyond a Holley four barrel carb which in itself I had great success with over the years. I wanted to move away from tearing down carbs and play with a laptop instead, keep my interests up and look at engine tuning through a new, more modern perspective. It was hard at first but I'm getting used to it.

I work on the philosophy 'I have....I use'. And there is the 'different' factor which loosely relates to 'cool' factor. It certainly surprises a few people when the bonnet is opened on that car.

Megasquirt in the signature. Yes, that's correct, I'm using it BUT just for fuel atm, Not ignition....just yet!

Edited March 15, 2014 by ozconnection

[ozconnection]

My ignition timing is 20 degrees static, with 30 degrees total.

[madkaw]

I missed the throttle body part --COOL. I'm doing just the opposite with MS running spark only for now. I'd say your leaving HP on the table with only 30 degrees total timing.

So the E-88 would be the MN47 over here correct?

Keep posting-good stuff

[ozconnection]

Thanks Steve, you may be right about 'leaving power on the table' This is a brand new combo for me and i have some work to do yet to optimise this combo. in the event that i do some ignition fiddling, adding some timing is certainly on the cards. ATM, however, I have some 'room' for error so I don't push too far/hard too soon and cause engine damage. This has become a fairly expensive motor and you know the rest...

As far as the head design is concerned, its nothing really like an N47 at all. Think more like a small chambered P90.

[Diseazd]

OZ......Great job on trying new things......with those numbers, you're doing something right...eh mate.....keep using your own instincts ....I'm proud of you! Guy

[ozconnection]

Thank you very much Guy! I went and sought out a guy local to me who builds engines for many racing teams and often sends complete engines O/S for owners who want something top shelf. I took an MN47 and a Schneider cam to him and I asked him if he could work some magic. Instead, at the end of a rather long conversation, I went home with the same head and cam and was convinced by him that he had a combination perfect for me. I bit the bullet and decided to go with his advice. Sure, it wasn't cheap, but its now become the standard bearer for the rest of the engine to live up to. A fantastic starting point, I don't really think another 10-20 rwhp is out of the question with some more tweaks. More importantly, I'm looking for more midrange if I can get it and that shouldn't be too hard either from what I've been told. Overall, I'm absolutely besotted with this engine! And how does the car go with this new combination......? What do you think. :-) At the track on Friday, I scalped my first V8, a 308 Cube Holden ute down the main straight of Sydney Motorsport Park. At the end of the session, guess who was peering under my bonnet to see "what the hell is under there?"

Happy days!!

[madkaw]

Any pics of the combustion side of the e-88?

Did you alter the advance on your 81zx dizzy to get only 30 degrees advance?

What's your measured CR?

Sorry for all the questions but it's in the details that we learn:)

[ozconnection]

The dizzy is bit of an odd one. During my years of collecting bits and pieces, I found this dizzy and I suspect a previous owner had modified it to include only 10 degrees of mechanical advance (20 to 30 degrees, in this case). I'm very happy with that, plenty of low rpm advance followed by an acceptable and perhaps somewhat conservative total advance. Bumping it up a degree or two shouldn't be too bad but I'm also considering adding vacuum advance, i'm assuming this wont be bad either since manifold vacuum at idle is 8-9 inhg and advance wont be excessive and really only work a little at part throttle. At WOT it'll be zero advance.

Calculated compression ratio is 10.1 to one.

...and a pic of the combustion chamber.

Edited March 16, 2014 by ozconnection

[madkaw]

Those chambers look nothing like my E-88

Pretty !

[ozconnection]

There was an earlier version of the E88 head, found out here on Cedrics and other lower specification engines, their quench isnt closed like this head. Like I said, think more like a small chambered P90 rather than like the N42 which is low quench.

Something maybe to consider!