daluv

Here's what Ive been thinking... I want some more power out of my B20B in my EG, but dont want to get into boost quite yet. I've heard of people swapping the camshafts with LS cams and getting a nice little bump in power from that. I was thinking, why not swap the whole LS head, if its possible. I figured, if you can keep the bottom end power and torque from the B20, then add the high end power from the LS head, it should make out to be a good motor with similar power figures as the B20Z. Conserns I have about it though are about the deck height and pistons. I think the B20's deck height is a little taller than the LS is, so would I have to swap in LS pistons to correct this? Here's the main question... Has anyone done a build like this yet?

speedooo

ls pistons wont work because b20's are 84mm and every other b series is 81mm. and i actually read that a b20 head is better than an ls head

daluv

Oh yeah, didnt even think of that, I was thinking of the length of the pistons and forgot about the width lol. So, my best bet might just be to swap the LS cams into my B20 head? Or, try and source me a B20Z...

97ShLude

I'm pretty sure that the b20b and ls heads are the same, I think the better flowing head that you guys are talking about is the pr8 head....I don't know which motor this comes from though

Boostedb20EH2

I have a b20 head with ls cams and ferrea valves. It used to be on my old boosted b20 set up. But i swapped heads. If you want it i can sell it.

smileycvc

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by daluv &raquo;</TD></TR><TR><TD CLASS="quote">I figured, if you can keep the bottom end power and torque from the B20, then add the high end power from the LS head</TD></TR></TABLE>

High end power? If you want to really add some power your gonna have to go with that turbo. Or switch over to a vtec head. B20s done really like to boost much, but there are some people out there making power with them. If I was in your shoes I would go with the LS cam shafts and then maybe some low boost later on.

Boostedb20EH2

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

B20s done really like to boost much </TD></TR></TABLE>
Yes they do

daluv

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

High end power? If you want to really add some power your gonna have to go with that turbo. </TD></TR></TABLE>

I didnt mean "high power" as in a lot of power. I meant the power made in the upper "higher" RPM's. Driving between LS motors and B20 motors, it seems like the B20 makes great power in the low to mid RPM's, but when it get in the higher rpms it seems to lack. With the LS motor, it seems to lack in the lower rpms, then starts to pick up in the mid rpms, and seems a lot more punchier in the higher rpms than the B20. I was figuring that if the two could be combined, then it would make for a very nicley equaled out powerband. As for boost... I know that the sleeves are pretty weak in the B20. How much would an internally stock block and head hold up to in terms of boost? I was thinking maybe 5-6psi on a stock block and head. Anyone have some experience to share? Boostedb20EH2, what do you think? Got any stories for me from your boosted b20 setup?

smileycvc

Not on stock sleeves they dont. You know that or you wouldnt have sleeved your motor right?

Boostedb20EH2

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

Boostedb20EH2, what do you think? Got any stories for me from your boosted b20 setup?</TD></TR></TABLE>
Hmm...Torque

No it was a built motor, and sooo fun. But i built something even more fun now, if youre thinking about swapping heads, vtec head is the way to go. The b20 made 292whp and 219wtq on 11 psi, and i did the headswap and it made 355whp and 284tq on 11 psi.

They have alot of potential, view the link i post down at the bottom.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by smileycvc &raquo;</TD></TR><TR><TD CLASS="quote">
Not on stock sleeves they dont. You know that or you wouldnt have sleeved your motor right?
</TD></TR></TABLE>
Very true.. But im beggining to think maybe thats a myth..View this thread. People are using blockguards and pushing 23psi on stock sleeves.
https://honda-tech.com/zerothread?id=2026738

smileycvc

Blockguards really do help, if installed properly. The problem with the b20 is the sleeves flexing. However just leaving the sleeves as they are no blockguard no sleeves is just a bad idea.

daluv

So putting 5-6psi on the stock block and head wouldnt be a good idea? Ive often thought about the cr-vtec deal, but am still worried about blowing the motor. Putting on a v-tec head, I would be changing the redline of the vehicle to 8200rpms (on say, a b16 head) Pushing a motor with thin sleeves to a higher rpm that the block was not intended for seems a lot like putting a lot of boost into the same motor, which could end up with me having a blown motor. If the stock B20 block and head can handle 5-6psi of boost, then I might do that and toss in some LS cams. I guess my main question at this point is can a stock B20B block and head handle 5-6psi in the form of a turbo.

daluv

I didnt even notice the thread link till after I posted ^^^, thats a killer thread! Thanks man!

smileycvc

The only problem with reving the block higher is the rod bolts if you change those you can rev the poop out of that motor just make sure you tune. Now if you boost I would still suggest the rod bolts and you have to get a tune. Without one the motor will be done very quickly. The biggest part to keeping a b20 together is the tune.

crxsir07

just boost your ls and sell me the b20 hahah, what ever you do it'll be fun in the EG!