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molecule 04-11-2006 10:40 PM

new engine plans
 
just waiting on some parts to arrive...

i have my jdm 3-stage head getting finished up this week...
port & polished and valve job...
but i'm not putting it on yet !!!
my turbo project needs considerable funding...
and i dont have a buyer for my fender jazz bass yet...

so in the meantime:

i'm on the edge of putting in a high compression setup
its stock bolt-on...no custom pistons or anything
basically
a vx head on a b7/b2 bottom
nice flat-top pistons and tiny *** combustion chambers
this yields on the old (inaccurate i might add) compression ratio calculators across the net @ 12.77:1
it should be close to that...but not exact
the old concept is that d15's deckheight is 207.45mm
the truth is they are all 207mm
new calculators should be sprouting about...if not already

i worried about detonation...
i'm not worried about spending more on premium fuel
someone like me who has been conditioned since 2000'ish to spending 1.30-1.50 a gallon driving 5000 miles a month...and who is now spending up around 2.75/gal ...
not to mention i've been putting the 93 in my car lately anyways because i dont think they even give 2 ****s about the quality of fuel they are separating in the towers and distributing...
its not a big deal for me to spend another $3 at the pump
i already feel pretty worked over by my gov...
maybe you have noticed in some of my posts...
lol

anyways...
thats the setup with a dx/lx 4.058 final drive tranny
hopefully i can get the intercooler up and running soon to help fend off detonation (yeah for the n/a setup)

all your bashing that its too high compression to run on street is welcome...
haha...i'm too adamant about at least trying it...




Matt Timion 04-11-2006 10:47 PM

I think it's a cool deal.
 
I think it's a cool deal. Where did you get the z1 head? I purchased a z1 head to put on my b2 block last year, but abandoned the idea after i realized the compression ratio would be so high. A series of decisions left me buying a d15b vtec-e engine.

Anyway, I'd be VERY interested in knowing how your setup goes. Are you going to run the p07 ECU with this setup?

Bunger 04-12-2006 12:06 AM

Re: new engine plans
 
Quote:

Originally Posted by eigerzoom
this yields on the old (inaccurate i might add) compression ratio calculators across the net @ 12.77:1
it should be close to that...but not exact
the old concept is that d15's deckheight is 207.45mm
the truth is they are all 207mm
new calculators should be sprouting about...if not already

Shameless plug:

www.zealautowerks.com

The d15 deckheight has been 207.00 for a LONG while... if you find anything that doesn't look right... lemme know. =)

Bunger 04-12-2006 12:10 AM

Re: new engine plans
 
Quote:

Originally Posted by eigerzoom
hopefully i can get the intercooler up and running soon to help fend off detonation (yeah for the n/a setup)

all your bashing that its too high compression to run on street is welcome...
haha...i'm too adamant about at least trying it...

Wait... are you going NA or boost? And are you saying you're gunna run an intercooler on NA???

molecule 04-12-2006 12:13 AM

right...intercooler (dry
 
right...intercooler (dry ice) n/a...
read my newbie post or my garage i guess

12.95:1

thanx for the link...

Bunger 04-12-2006 12:42 AM

How are you regulating the
 
How are you regulating the boost to 1 bar absolute? (0 psi)

How long does the dry ice last??? I wouldn't think you would get much heating from running such little boost... I guess it depends on what altitude you're at.

molecule 04-12-2006 12:50 AM

boost will come later
 
boost will come later (hopefully sooner)
but with another head

intercooler i'd like to get on there asap for this setup
should have some hot chamber temps...

dry ice...i dunno...i see it alot in my medical shipments...
typically it lasts 8 hours in a cardboard box
look up frostick or frostic on ebay for some diy shizz...

zero psi
i have a couple threads around the internet describing it
here's the picture...i'll copy and past my words about it in another thread sometime...or here...i'm just lazy right now
basically its a 3lb spring in an external wastegate
so really its 3psi...minus a little with some vac/boost help...
TURBO OFF - would be the zero psi state

https://users.adelphia.net/~digitalco...Controller.jpg

molecule 04-12-2006 01:01 AM

just saw mr. timions
 
just saw mr. timions post...sorry...
uh...no on the p07...
i'm chipped...so it will be hand tuning in crome free...
i know nothing about high compression tuning...
the vx head only revs to 6k anyway...so i shouldn't be in too much trouble up top...
i'll probably advance my cam a whole tooth for low end power on top of that...
basically as much low/mid power/performance as i can possibly get
and then fight off the detonation
it will be a 1.5L so fueling will stay about the same
i think my battle will be with correct timing and a/f ratios...
i'm a tuning newb throwing myself into the abyss of high compression
anticipating a blown motor...but hoping for the best...

Bunger 04-12-2006 01:18 AM

Retarding the cam one tooth
 
Retarding the cam one tooth is like 18 crank degrees... that is a TON. The stock cam timing should be fine for what you're trying to do. However, with the huge increase of compression, I would start by retarding you ignition a good 6 degrees. I'm not sure how lean you're going to be able to go with almost 13:1 CR... if you can get ahold of some 103-105 octane fuel... you should be able to set the timing back to stock =) Are you in an area that has E85? If so, replace the injectors with some 240's and you'll be fairly close to the needed fuel.

Sludgy 04-12-2006 04:00 AM

I have a designation for the engine you're building
 
A hand grenade. With 13:1 and pump gas, it's going to be raining piston shrapnel.


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