Turbocharging? Vacuum? Too much thinking. Smart people unite

[pete c]

Are you saying that that this car, as delivered from the factory only got 21 mpg?

Sorry, but that sounds like a load of bravo sierra. I can't imagine there has been a civic sold here that ever did any worse than high twenties.

[Wiegraf]

Honda Prelude.

https://www.fueleconomy.gov/feg/noframes/9779.shtml

[Baltothewolf]

I think Pete was confused, and does not know Hondas in general very well. (no insult intended).

Pete, no civic ever from the factory came with a H22 variant engine. That engine was home to a couple of Hondas, the Prelude (and I Believe the S2000 had an H engine as well). The H22a he has in his civic was swapped.

[Fingie]

S2k has F2x engines. The F-series block is designed better for RWD applications.

[pete c]

Originally Posted by Baltothewolf

I think Pete was confused, and does not know Hondas in general very well. (no insult intended).

Pete, no civic ever from the factory came with a H22 variant engine. That engine was home to a couple of Hondas, the Prelude (and I Believe the S2000 had an H engine as well). The H22a he has in his civic was swapped.

You are correct sir, I am woefully undereducated in Honda engine nomenclature and no worries, you'll have to try much harder than that if you want to insult me. Especially on the interwebs where the default setting of 97% of people seems to be arsehole, so that is what I expect.

Thanks for the education. I assumed we were discussing civics and you know what they say about assumptions. I would still expect better mileage from even the Prelude and I still don't believe that bolting a turbo to it would give better MPG, all other things being equal.

[Wiegraf]

Originally Posted by Fingie

S2k has F2x engines. The F-series block is designed better for RWD applications.

F20c and F22C1..

Alot of confusion because every other f series was for fwd applications and was basically...

F series have DOHC and SOHC which is weird because normally honda is good with coding.

All of the 40+ D series are SOHC (except one).

All of the B series are DOHC.

All H series are DOHC "Big blocks"

And F series..just. does..whatever.

[Wiegraf]

QUOTE=pete c;538281]Thanks for the education. I assumed we were discussing civics and you know what they say about assumptions. I would still expect better mileage from even the Prelude and I still don't believe that bolting a turbo to it would give better MPG, all other things being equal.[/QUOTE]

And im not generally saying this (inconclusive testing) either.

Multiple things come into play... to list one I have no catalytic converter or mufflers, so free flowing exhaust may make it easier at my 3500 rpm cruising..where at 1800-2500 i might lose low end power due to too much free flow. (Please no one say backpressure)

[joemac]

The higher efficiency with the Honda 1.5L Turbo in the new Civic is from its use of direct injection and a head integrated exhaust manifold. Direct injection is probably worth 1-1.5 points of compression ratio. IEM helps keep the engine out of enrichment under boost, but to really work well it needs a second thermostat and a split cooling system (ie., seperate the block and run it slightly warmer than the head and IEM at high torque). Honda doesn't do that on the Civic, but it is showing up on some VW engines in Europe.

[ar5boosted]

Originally Posted by Wiegraf

On 2 identical motors.. one n/a , one turbocharged.

Cruising at or closer to 0 inHg
Vs
as much vacuum as possible....

which is better for MPG?

Just saying hello really. Not wishing to break up the Honda discussion but with [my] Toyota, a 1991 Turbo Gt-Four it got better fuel economy than the standard normally-aspirated Corolla of the day.

There has been a big drop in engine sizes lately, Honda are just one of many.

The integrated exhaust manifold that Honda claim as some big invention was also on my 1991 Toyota Just saying.

Suzuki + Renault + Toyota + Honda are all at these configurations but afaik Toyota were the first in 1990 (?)

[Fingie]

i own a GT-FOUR. It's 20 mpg at best for me lol