Long time Lurker to now active member LOL

[Logic]

Hi-n-welcome.

[ranksol]

thanks for sharing this i am thankful to you

[Logic]

Originally Posted by mpEg_build

Hey guys! Finally making my introduction after being a member for 9 years now.

I have long been facinated by your guy's quest for mpg and been intrigued about Honda's lean burn technology. I used to own a EK sedan that was d15b swapped (3-stage vtec motor) and was getting 40 mpg before i crashed it a few years back.

Now I own multiple cars and one of them is a EG civic vx but that has been swapped into b series and I have decided to retire it from being a racer boy to good looking fuel sipper boy HAHAHA

I recently acquired a d16y5 and plan to obd1 swap it and run the federal vx ecu if i get my hands on one. I do plan on building a build thread on it and I think this project would be similar to Import Tuner's project sipper build. Saving gas and looking good at the same time hehe.

More power to you guys and hope that peeps here could answer my noobie fuel sipping questions LOL

Hi! Welcome. It's nice to see someone who works on engines!

If you are into lean burn do check out pgfpro's lean burn engines here and elsewhere.

IIRC he's doing 50mpg in an un-aero'd Talon, then 7 second quarter miles! (is it a quarter?)
He's using F1 style pre-chambers (rich mixture) and then an AFR of 30 to 1 and a 30 to 1 compression (Turbod) ratio!
Yes you read that right! That's how F1 finishes a race without refueling.
Trick is to get your head around how the cheap, simple pre-chambers are emptied/filled!

For the main chamber:
As I understand things there's a window of AFRs in which engine temperatures increase, but leaner than that and temperatures start to decrease and soon wont even ignite!
Here pgfpro warms things up using fuel and intake air heating, but most of all that huge (efficient!) compression ratio!

You remember Smokey Yunick's Hot Vapour engine..?
(I think there is some ...er... 'different combustion chemistry' going on here, but cant say more till I'm sure)

NB that his accelerator is basically the AFR (ECU) so like a diesel; no pumping losses!