I'm getting ready to put a b20 head off of a crv onto a b18b block in an LS with a burnt valve i know the head will fit but is it a good idea? the cylinder volume on the head is larger than on the b18 so that will ultimately reduce my compression ratio, the intake valves on the b20 are bigger but the exhaust valves are the same size so ultimately i see this match up as a loss but the price on the head was good(free). also should i use a b20 head gasket? i'd appreciate any insight or advice. thanks.

 

You're not sure which head gasket to use...yet you seem to know so much about the dynamics of each head. Something doesn't smell right there.

The B20B/Z are both identical heads to the B18B. The bottom end of each motor is where you are going to find more differences. And even there, they are minimal.

Basically, you're not going to gain anything by swapping to the B20 head. Just get the necessary repairs done to your LS head.

 

both motors are preatty much the same thing besides the bore
the b20 has a 84mm bore oppose to the 81 mm bore

 

I would assume he is right that the b20 head has a larger combustion chamber...seeing as how the cylinders are larger. And if they aren't different, then why do some people run b20's with LS heads??? Just curious like the guy who posted the question.

 

I'm not trying to get any performance gains I'm just trying to make sure the power loss is minimal. the head was free(much cheaper than a valve job) the water jackets on the new b18 gasket dont quite line up on the b20 head so I was wondering if that was going to pose a heating problem. Don't be so quick to criticize somebodies knowledge just cuz you feel insecure about liking jenson button the british fluke. just kiddin he's OK

 

i believe some people run LS heads on b20 because the combustion chamber is smaller therefor increasing the compression ratio. maybe?

 

mrx


Modified by mrxracing at 12:55 AM 6/5/2004

 

thats what i'm talkin bout bitches

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fasterthanU &raquo;</TD></TR><TR><TD CLASS="quote">I'm not trying to get any performance gains I'm just trying to make sure the power loss is minimal. the head was free(much cheaper than a valve job) the water jackets on the new b18 gasket dont quite line up on the b20 head so I was wondering if that was going to pose a heating problem. Don't be so quick to criticize somebodies knowledge just cuz you feel insecure about liking jenson button the british fluke. just kiddin he's OK </TD></TR></TABLE>

I wasn't questioning your knowledge, but if you go to your original post and read it to yourself, you'll see where my thoughts came from.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fasterthanU &raquo;</TD></TR><TR><TD CLASS="quote">i believe some people run LS heads on b20 because the combustion chamber is smaller therefor increasing the compression ratio. maybe?</TD></TR></TABLE>

Now you're talking sense here. But with both engines already at low compression ratios, the difference shouldn't be a night and day thing. If you lose a tenth of a point or gain a tenth of a point, it probably won't affect your engine too much.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mrxracing &raquo;</TD></TR><TR><TD CLASS="quote">screaminteg is an *** hole it looks like to me, and probably can't even drive his screaming teg...huh?</TD></TR></TABLE>

I have nothing to prove to you or anyone one here. This is a free web forum geared towards giving everyone a learning edge on Honda vehicles.

I could also careless what you or anyone else thinks of me and my car on this forum. Like I said, this is a free place, I'm here to share my knowledge and experiences as well as earn more knowledge from other members, not from you obviously.

But since you think you are top notch on here, why don't you explain to me what the slip angle or your tires is when you enter a corner while racing? I bet you can't do that without looking it up.

Later guys...good luck with your engine fasterthanU, I hope it works out for you.

 

mrx




Modified by mrxracing at 12:55 AM 6/5/2004

 

what's this "we" ****? You didn't start this topic, fasterthanu did.


You can make all the assumptions about me that you want. It's not going to make one bit of difference outside this thread.

Losing my pride? Not here...that's for certain.

And I'll be "an arrogant *** hole" as long as the sun rises and falls.

Whatever makes you feel like a better person though. If you think you're a better man than I, great for you. Keep living life like that and you'll have lots of lifetime friends, I'm sure of it.

to you, because you've got it all planned out.

 

mrx


Modified by mrxracing at 12:54 AM 6/5/2004

 

ScreaminTeg I'm not going to defend my question or the amount of knowledge I have as compared to a mechanical engineer. I wasn't offended by your response in-fact I understood completely where you were coming from its just that in the limited forum that we communicate within we are somewhat limited to the descriptions we can give in an aim to get a necessary response and the abrupt manner in which you handled my thread caused me to misunderstand your intention. I use this sight as a reference and often encounter dull witted sarcasm so forgive me for getting defensive. I hope to pick your brain in the future as you sound like a somewhat educated individual (your driving ability is yet to be determined and hopefully not found wanting) I also wanted to talk some F1 **** on you since brand loyalty can only take us so far when selecting heroes. Schumacher is the best human ever to drive a 4 wheeled vehicle. As a side note "slip angle" is not a predetermined number that can be looked up as reference material. It is condition subject to too many variables but 90 degrees will make a man out of all of us. Hope to BS with ya soon face to face on a back-roads ball shriveler. Peace

 

You could always have your block milled or run a thinner gasket to make up for the loss in compression.

 

ups for Patmcd! he's right about that, and yes i have a friend who has a B20/Ls head working in progress and he said he had a hard time with the head gasket and got the block milled, and the LS gasket worked and all so i dont know good luck and post what worked for u!

 

All B.S. aside has anyone used a B20 head with a B18 head gasket and been successful?
The reason for asking is the b20 gasket is 3 days away unless i spend 100+ $


Modified by mrxracing at 3:48 PM 6/4/2004

 

Mrx and faster....

After searching through Team-Integra and a google search for further review, I have this to conclude:

The B20b/Z head is 100% identical to the B18B head. The B20 combustion chamber is 81mm, as is the B18B. It's just the bore of the block that is 84mm.

That would lead me to believe that an LS gasket would be used.

Just for reference...here some some specs of the B20B/Z and the B18B:

B20B

97-98 (years)
126hp@5400 rpm
133lb.ft@4300
6200 rpm redline
8.8:1 CR
84mm bore
89mm stroke

B20Z

99-00
146hp@6200
133lb.ft@4500
6700 rpm redline
9.6:1 CR
84mm bore
89mm stroke

B18B1

94-01
142hp@6300
127lb. ft@5200
6800 rpm redline
9.2:1 CR
81mm bore
89mm stroke


This page can be used for general B20 refernece material.

Hope that helps you guys.

 

screaminTeg thanks for the info I really appreciate you taking a deeper look into the subject. I've found that the heads aren't identical the dial caliper doesn't lie(or does it?) anyway I'm going to modify the B18b head gasket so that the water jackets line up better. I will keep you posted!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ScreaminTeg &raquo;</TD></TR><TR><TD CLASS="quote">Just for reference...here some some specs of the B20B/Z and the B18B:

B20B

97-98 (years)
126hp@5400 rpm
133lb.ft@4300
6200 rpm redline
8.8:1 CR
84mm bore
89mm stroke

B20Z

99-00
146hp@6200
133lb.ft@4500
6700 rpm redline
9.6:1 CR
84mm bore
89mm stroke

B18B1

94-01
142hp@6300
127lb. ft@5200
6800 rpm redline
9.2:1 CR
81mm bore
89mm stroke</TD></TR></TABLE>

None of that has anything to do with the combustion chamber's size...which is the subject here, no?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostinb20vtec &raquo;</TD></TR><TR><TD CLASS="quote">

None of that has anything to do with the combustion chamber's size...which is the subject here, no? </TD></TR></TABLE>

I know, you must've missed this part of my post:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ScreaminTeg &raquo;</TD></TR><TR><TD CLASS="quote">Mrx and faster....

After searching through Team-Integra and a google search for further review, I have this to conclude:

The B20b/Z head is 100% identical to the B18B head. The B20 combustion chamber is 81mm, as is the B18B. It's just the bore of the block that is 84mm.

That would lead me to believe that an LS gasket would be used.

</TD></TR></TABLE>


Once again, thanks for posting just to make yourself appear superior. In case you missed the rest of the posts in the thread, there were a few of us that just got done arguing about this, and we've sorted it out, put everything aside, and are now concentrating on the issue at hand.

And to top it all off, no, the subject here is not the size of the combustion chamber. It started off as he wanted opinions and advice as to whether or not he should install the B20 head on the B18B block. Then, he wante to know which gasket to use.

Also, in your previous post, you "assume" that the combustion chamber is larger becuase the cylinders are. Just remember, you do know what they say happens when you assume?

Back to the problem....faterthanU or Mrx...can either one of you perhaps post pictures of the combustion chamber of the B20 head? Also, is it a B20B or B20Z? That would might make the difference there. Since the 'Z' is of higher compression ratio, made it's combustion chamber is smaller, and the 'B' is larger. Makes sense, doesn't it? I'm really curious about this now, because everywhere I turn for info, they all say that the heads are the same. i dunno...I need to find places with pictures

 

Thank you screaming teg for the information, fasterthanu ended up just cutting out a little around the water jackets which was the main concern and difference in the head..The gasket also hung inside the valve circle just a hair but should be fine,I'm not sure which head it is, a buddy of mine traded it to me for d15 engine that i had sitting around and never thought to ask, i can check though. and i have some pictures but i have never posted pics yet so i'm not quite sure how to.. but one thing is for sure no matter what the outcome is we will post it!!!


thanks again, take care..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostinb20vtec &raquo;</TD></TR><TR><TD CLASS="quote">I would assume he is right that the b20 head has a larger combustion chamber...seeing as how the cylinders are larger. And if they aren't different, then why do some people run b20's with LS heads??? Just curious like the guy who posted the question.</TD></TR></TABLE>

the topic is toasted.. but for this guy.. they run ls heads on b20b blocks because they are cheap bottom ends w/ a bigger bore. increasing torque. ppl preffer the b20b bottom end because it may, sometimes be cheaper then boring out the ls botting end and oversizing the pistons.