F22 or F23 ... (boosted)

Ok, So Im planning on Finding a Low Mileage motor to replace my turbocharged Original F22...
My question is: ....
 
Which motor is better for boosting?  The F22 or the F23 ? 
I Do Not plan on touching the internals...
 
Thanks

From what I've heard in the past the F22 SOHC V-Tec works the best for turbo.  However, I have never seen any difinitive comparison

HMMM,  i wonder why the one with VTEC... I imagined that one maybe had a higher compression ratio?
 

The compression ratio for the f22a1, f22a2, & f22b1(VTEC) is 8.8:1.
Compression for f23a1, f23A4, and f23A5 is 9.3:1
This is according to the Specs from a link in the DIY section.  I believe the data is taken from a Chilton manual so I'm not 100% sure it is totally accurate.  The same table shows the f23A5 puts out 150hp and I know that is wrong (it should be 135).
Looks to me that if lower compression is what you are looking for, f22 is your winner.
It is also my understanding that turbo manifolds are pretty hard to find for the f23, whereas they are readily available for the f22.

Ok cool,...... well then, If I plan to stick to F22 so Everything fits Exact.... Do you know which F22 (VTEC  or  Non-VTEC) has a lower compression?
Im sure they both have the iron block?

not sure which one is lower, I'd assume the non-tec one but that's just a guess.  if you go with f22 there is a great site f22parts.com that is loaded with stuff for them

MSN.com shows the VTEC f22 is much lower compression than the non-VTEC: http://autos.msn.com/research/vip/spec_engines.aspx?year=1995&make=Honda&model=Accord&trimid=-1
Again, I cannot vouch for the accuracy of MSN, but I think they are usually pretty good.
Crap....I just realized MSN says they are DOHC (obviously wrong) It also says the f22b2 is turbocharged
Here's Wikepedia's specs on f-series engines: http://en.wikipedia.org/wiki/Honda_F_engine

Ok i did a quick search,,,,, and apparently according to Wikipedia Encyclopedia
compression on both F22 are 8.8:1
 
But what makes the VTEC model have 15 more HP?

VTAKKKK does!!
There is a thread that explains how vtec works somewhere on this site.

Here you go: http://asia.vtec.net/spfeature/vtecimpl/vtec1.html (thanks sir_nasty)

Vtec gets more hp because it "switches" camshafts at higher rpms. (sorta not really, http://youtube.com/watch?v=AcT_ZyY3F0k theres an explanation for visual learners, that link made me more confused^)
heres another explaination: http://www.youtube.com/watch?v=q24D0xv49d4

Vtec is bad for boosting. To tell you the truth, im not really sure why. Its just what i hear. Maybe one of the more experienced members will chime in and say why.

vtec isnt really bad for boosting if you built the motor. Alot of pressure it put on the motor when VTEC and turbo are both used at high RPM. without proper biulding you can damage your motor. PLus alot of honda racing motors like the k20 and b18. use very high compression ratio. One of the reasons the new RDX turbocharged when it reaches vtec rpm range actalluy lowers the boost to the motor stays reailbe and strong. But at low rpm it uses more.

How does VTEC put pressure on the engine?  It opens the valves more and longer which would reduce strain.  I could forsee a problem if the turbo is allowed to engage before the VTEC though.

On a turbo setup you want to have the overlap duration of the open intake and exhaust valves reduced to a stock level, even with tuned aftermarket cams, and keep it at the same duration in the entire RPM range. Vtec works great when you have no turbo cause the longer overlap duration allows some of the incoming fresh help push the exhaust gases out, leaving a cleaner atmosphere to burn in the cylinder. The back pressure produced by having a turbo's exhaust turbine in the exhaust flow can actually cause some of the exhaust gasses to flow back into the cylinder if the exhaust is open too long and the duration of overlap is too long. This is why non Vtec or vtec eliminating cams and rollers are often found in real built turbo systems

Looks like Shadow just pwned this one. 

F22 and F23 are both Iron sleeved, But F23 rods are thin like a spaghetti... Stay with F22 block and since you want to swap a head, get 1 from H23a1 DOHC prelude, some ajustable cam gears and... You'll be set for around 160 hp baseline. With all the ajustability you wish to have on a turbo project. I'm personnaly rolling a 150 000 miles F22a4 with DOHC head in my civic... Pushing down nearly 250whp with 14psi (I know, It wont last long but I'm currently building another F22a4 with forged rods&pistons) Already 8000 miles on the setup, Still running very strong !!!

quote:

ORIGINAL: falkore24

How does VTEC put pressure on the engine?  It opens the valves more and longer which would reduce strain.  I could forsee a problem if the turbo is allowed to engage before the VTEC though.

 
Why does the ECU do all the oil checks and coolant checks to make sure everything is good before it activates? It must cause more starin on the engine and the ecu wants to make sure everything is ready before it delivers that power.

I don't like speculation.  Explain the checks that you are talking about.  As far as I know, oil pressure and coolant temperature are monitored continuously on all OBD2 cars.

quote:

ORIGINAL: HondaRacer4Vtec

quote:

ORIGINAL: falkore24

How does VTEC put pressure on the engine?  It opens the valves more and longer which would reduce strain.  I could forsee a problem if the turbo is allowed to engage before the VTEC though.

Why does the ECU do all the oil checks and coolant checks to make sure everything is good before it activates? It must cause more starin on the engine and the ecu wants to make sure everything is ready before it delivers that power.

 
VTEC does not put strain or pressure on the engine. If it did, it wouldn't be there in the first place. However, VTEC will not engage unless the conditions are right, engine speed, oil pressure, etc.

quote:

ORIGINAL: BlkCurrantKord

VTEC does not put strain or pressure on the engine. If it did, it wouldn't be there in the first place. However, VTEC will not engage unless the conditions are right, engine speed, oil pressure, etc.

 
so, my car is turbo and i left the VTEC on... should i unplugg the VTEC?

Noooo .... don't do that!!!   If you disconnect VTEC without changing the camshaft, your engine will always run with the valves in the partially closed position hurting your performance majorly!  If you use a VTEC defeating camshaft, this will be changed and the cam is tuned to move the valves properly without VTEC engagement.  For your setup, you just want to make sure that your turbo kicks in when VTEC is already in the high cam mode.

quote:

ORIGINAL: KevinAccord

quote:

ORIGINAL: BlkCurrantKord

VTEC does not put strain or pressure on the engine. If it did, it wouldn't be there in the first place. However, VTEC will not engage unless the conditions are right, engine speed, oil pressure, etc.

so, my car is turbo and i left the VTEC on... should i unplugg the VTEC?

 
Uggghhh...no.

you can tho...... if you want the turbo to spool up really late in the rpm band but youll probably get better gas mileage at the sacrifice of hp

NO! YOU STILL CANT!
different cam profiles do different things across an RPM range.
one profile idles really well but sucks at high rpm, while another profile will suck at idle (leading to that BRRUmmmbumbumBRRUmmmbumbum sound from muscle cars) while dominating the high rpms.
Non-Vtec engines have a compromise between the two profiles.
Vtec engines have one profile for the low rpms and one for the high rpms. if you unplug it, youll be left with only the low rpm cam profile. You have to put in a Vtec Defeating cam to defeat this, or in other words, you need to put in a camshaft with a compromising cam profile, similar to the F22B2's camshaft (non-vtec)

you can say no you still cant all you want......  when yes... you can.....    it doesnt mean it wont be a waste of time and/or money or even be long term solution to the life of the engine