Engine weights?? - Honda Forum / Acura Forum

tbr1 · 11-28-2005, 10:00 AM

Been searching forever for info on different block weights.
I want to put in b18c5 in my car but my friend keeps telling me to go B20 with 16A head. My car is built for circuit so weight is a big concern to me. Any help on this? Another thing would there be much difference in engine position in the engine bay? obviously I dont want the engine sitting anymore forward over the cross member.

BurntRubber87 · 11-28-2005, 12:03 PM

They are probably within 30 lbs of each other in weight. The CRVTEC is a good motor combo if built right, especially if you're running N/A for circuit. The C5 motor is expensive and probably right around the same HP, if not alittle less than a CRVTEC frankenstein motor. Search is your friend, too. DO alittle research on the crvtec

phan · 11-28-2005, 03:19 PM

IMO, if you're going to spend money on building a motor, just all all gs-r or something like that. frankenstein's can be built right and run fine, but you can yield the same, if not better, results without having to throw a head on a block that didn't come with it.

hondapride59 · 11-28-2005, 04:18 PM

Quote:

Originally Posted by phan

IMO, if you're going to spend money on building a motor, just all all gs-r or something like that. frankenstein's can be built right and run fine, but you can yield the same, if not better, results without having to throw a head on a block that didn't come with it.

frankenstein motors are not very reliable unless you love dumping money into them just to become reliable

i would say just go with a b18c1 and build it up from there, its a great starting platform a great motor and has great potential for ur track car

phan · 11-28-2005, 04:48 PM

hence my reply

AK_CRX · 11-28-2005, 08:48 PM

Theres a lot of talk about how unreliable ls/vtec or crvtec setups are due to bad rod/stroke ratio, or weaker sleaves in the crv's case... I think a lot of people don't realize that they are great engines when used within their ability... The number one reason this rumor came up is people running either too much boost or too running them at too high of an RPM or BOTH. The truth is, if you built a crvtec or an ls/vtec, and just added bolt ons and cams you would have a pretty reliable engine as long as you respect the limitations of the bottom end. In my opinion: if you ever want more than 250 hp, or you ever want to rev past 8,000rpm Don't do an LS/vtec or crvtec. but on the other hand if you are on a budget, want a great streetable setup with an awesome powerband, and you are satisfied with <250hp then the crvtec or lsvtec is a perfect option. 250hp doesn't seem like a lot but remember that 250hp can pull off an 11 second run in a crx...I have personally seen a daily driven ls/vtec that has logged over 30,000 miles since its conversion and now has 120,000 miles on the stock bottom end. The car is used for commuting, and revved to 8,000rpm on a daily basis. I am not saying that 250 hp is the absolute limit of this engine, but past that point I would not trust its reliability without spending a lot of money which in my opinion ruins the whole point of a crvtec or ls/vtec... So lets be realistic, its unexperienced people with unreal expectations that don't understand the nature of the beast that blow them up. You can't just sum up those two engines by saying they are unreliable. And there is very little difference in weight between any of the b-series engines.

BurntRubber87 · 11-28-2005, 09:38 PM

Exactly, rumors come from people just throwing a b16A head on a stock LS bottom end, without even taking the motor out of the car and spinning rod bearings and snapping rods, going to higher rpm's then the LS or B20 was ever meant for. Now, with better bearings, aftermarket rod bolts like ARP, and possibly even stronger rods, a LS/vtec or crvtec setup is pretty reliable.

tbr1 · 11-28-2005, 10:31 PM

thanks for ur replies. BTW what is the stock rev limit in the b20??
Lots of conflicting opinions, some say b20 not design for reving, others say they rev it to 9k with no problems.

Originaly i had on mind for both engines (b20/16a head or b18c5) was just jun stage 3 cams, valve springs and titanium retainers, thiner head gasket, larger throttle body. I currently have motec m4 so tuning will be a breeze. I do intend to rev to 9K. The only reason the frankenstein idea came up was because of the extra torque. I would think both would have simular top ends.

Im aiming for 230-250hp would be plenty for the crx around the track

phan · 11-29-2005, 03:14 AM

wtf? ok, i'm a bit drunk but still confused as ever. wtf are you looking to spend? give me a $$$$ idea and we can talk.

*i'm drunk but still literate...nice!

88ReX · 11-29-2005, 09:53 AM

What exactly is circuit racing in your case? If it is road racing then I suggest you steer away from the b20 just because they do not last under those conditions(a simple search on HT's RR forum will tell you that). Lsvtec might be alright for it but you will be a lot safer with the b18c and last a lot longer with it too.

AK_CRX · 12-05-2005, 04:29 PM

Quote:

Originally Posted by tbr1

thanks for ur replies. BTW what is the stock rev limit in the b20??
Lots of conflicting opinions, some say b20 not design for reving, others say they rev it to 9k with no problems.

Originaly i had on mind for both engines (b20/16a head or b18c5) was just jun stage 3 cams, valve springs and titanium retainers, thiner head gasket, larger throttle body. I currently have motec m4 so tuning will be a breeze. I do intend to rev to 9K. The only reason the frankenstein idea came up was because of the extra torque. I would think both would have simular top ends.

Im aiming for 230-250hp would be plenty for the crx around the track

ok, now that I know you intend to rev to 9k, I can't reccomend an Ls/vtec or a crvtec, sure its possible, just not plausible. You'd be spending an assload of money for a few pounds of unneeded torque. I say unneeded torque because the significant torque difference from an ls or b20 would be between 2-5,000 rpm, and thats a range where a track car should rarely if ever find itself. if torque is what your after may I suggest a b16 or b18c with a jackson racing supercharger? then you'd have more low end torque then an ls or b20, no big reliability factor at 6-7psi, much more high end hp, and little weight gain. might be out of your price range but sounds exactly like what your looking for.

phan · 12-05-2005, 06:59 PM

IMO, stay away from the frankenstein setups for "reliability," and build a gs-r. you can up the displacement to 2.0L and increase torque, still revving higher than a stock b20/vtec more "reliably."