LS Vtec

[EG4]

Can someone give me a description what it is exactly?

i'm having a guess that its a b16a head on an LS integra block.

But i would like to know if what i'm thinking is accurate or not

[wynode]

Yes thats pretty much it.

Putting a DOHC VTEC head on a B18b block. A few minor modifications need to be made, but it gives you DOHC VTEC on a budget. Quite popular in the US, but not over here.

[joneblaze]

Yes thats pretty much it.

Putting a DOHC VTEC head on a B18b block. A few minor modifications need to be made, but it gives you DOHC VTEC on a budget. Quite popular in the US, but not over here.

...so what would be a ballpark figure to get the GSi VTEC'd? :?:

[VTEChnique]

DOHC VTEC on a budget.

Not on a budget.. with all the extra work rebuilding the engine.. you'd prob be cheaper to get a stock B18C ( integra VTiR )... the advantage of the LS-VTEC frankenstein motor is the added torque from the LS block and bottom-end. you will be approaching B18C-R territory with the LS-VTEC with the B18B having almost the same torque output as type R, but then with a high-flowwing B16A head you get the best of both worlds.

essentially the B18C-R is a B18C block with a P+P B16A head.

advantage of LS-VTEC over B20-VTEC ? well the B20-VTEC has a bucket-load of torque but requires the bottom end and block to be built-up to withstand the high-revs of the VTEC head.. however the B18B ( LS ) is already a bullet-proof motor and can handle high RPM.

[wynode]

Err no.....the B18B with the VTEC head has a lower compression ratio than the B18C from the vti-r, thus good for turbo setups. It is cheaper in the sense that it doesn't require afull engine change. Ideall you change the ECU to an equivalent VTi-r one, and make a new oil line to activate the VTEC solenoid.



essentially the B18C-R is a B18C block with a P+P B16A head.

The B18C7 (ITR) is a totally different motor apart from just the head. To name a few these are the differences b/w the ITR and vti-r motor

1. Ported+polished head
2. lighter valve springs
3. lighter valves
4. Special cylinder wall coating
5. Totally different Pistons and conrods to the vti-r.
6. ITR has different intake runners to the ITR (vit-r has primary & secondary intake runners, whereas ITR has one set optimised for high RPM)

I don't know where you got the facts that the B18B + VTEC gives you similar output to the ITR.

[joneblaze]

umm....Win? wanna answer my question in simpler terms than above? :roll: :oops:

[vti-2]

Quite popular in the US, but not over here.

No doubt. The LS VTEC conversion is huge in the States, a lot of guys building those up for boost in particular. Don't believe me? Have a look at H-T and do a search. There's a huge knowledge base there on this topic, plenty of workshops that sell fully built engines too. ;)

[one more chance]

if you put a B20 block next to a B18B block you will clearly see the difference in size, the B20 has thicker walls, however the B20 have much weaker sleeves...something that needs to be addressed if youre gonna turbo charge ur B20. the Lsvtec conversion is a good idea and you may put out similar power with the b18c, but the reliability is questionable!

there is no comparison between a B18C1 and LSVTEC.
the B18C1 is so much more a superior engine!

[EG4]

so in essence, a LS vtec is leaned towards boost then?

i get the feeling this thread might get locked into FI soon

neway, what's the advantage of the using the LS vs b18 on boost?

and does LS come from our LS integra's or is that just the american equivalent of the vtir?

[wynode]

LS is the USA version of our GSI.

The LS-VTEC is more suited to FI because it runs a lowercompression than the B18C DOHC VTEC

[VTEChnique]

[quote="wynode"
The LS-VTEC is more suited to FI because it runs a lowercompression than the B18C DOHC VTEC[/quote]

YEAH SO YOU KEEP TELLING US _ DO YOU KNOW ANYTHING ELSE ABOUT THIS ENGINE ? OBVIOUSLY NOT !!!!!


yes it IS lower compression than B18C, but if you check out the output of the B18B you will be surprised to notice it actually has a higher TORQUE output some 2,000RPM lower than the B18C..

this is why we add the B16A VTEC head to the B18B Block - to give it some top-end power.. you are left with a motor that is arguably stronger than the B18C but it is also better flowing and open to tuning a lot better than the B18C head.

the B18C head is regarded as the worst of the DOHC VTEC's.

MR EXPERT !!

[vti-2]

Do you have to yell?

Take a 5 minute break, you obviously need it.

[SpiceyTeg]

Yes thats pretty much it.

Putting a DOHC VTEC head on a B18b block. A few minor modifications need to be made, but it gives you DOHC VTEC on a budget. Quite popular in the US, but not over here.

hey, do you know who do these sort of conversions in Aus.. i got the GSI, a few engine mods, but keen as to get some more power :D

[ALLMTR]

[quote="wynode"
The LS-VTEC is more suited to FI because it runs a lowercompression than the B18C DOHC VTEC

YEAH SO YOU KEEP TELLING US _ DO YOU KNOW ANYTHING ELSE ABOUT THIS ENGINE ? OBVIOUSLY NOT !!!!!


yes it IS lower compression than B18C, but if you check out the output of the B18B you will be surprised to notice it actually has a higher TORQUE output some 2,000RPM lower than the B18C..

this is why we add the B16A VTEC head to the B18B Block - to give it some top-end power.. you are left with a motor that is arguably stronger than the B18C but it is also better flowing and open to tuning a lot better than the B18C head.

the B18C head is regarded as the worst of the DOHC VTEC's.

MR EXPERT !![/quote]

Tell me more MR EXPERT, I'm alwways eager to learn MUHAHHAHAA

[pornstar]

Thats news to me. If thats the case, ill go buy a 4,500 dollar front cut, and port and polish the head and sell it as an ITR front fut for 9,000...

EG4 if ur who i think u are, illl kick u in da left nutsack when i next see ya. But as far as LS/VTEC goes, they do it in the USA, because there is an abundance of parts (and knowledge) in the hondas over there. Its about 500 USD cheaper to get a b18a/b as opposed to the b18c. 500 USD can get alot of other stuff, hence with their knowledge base and prices, its easy for them to addd a b16a head to the b18a/b. As far as torque etc, I dont know how much more tourque there is, but there cant be much, as they are still both 1.8s in essence. Admittedly, I dont know much about that difference, but I do know that with the knowledge and prices in Australia, I wouldnt bother with such a conversion.

Ill add in that the b18c bottom end is much stronger than a b18a/b bottom end, the engine is braced/girdle etc which makes it stronger.

As for the ITR, Honda didnt employ its racing heritage and develop a race type car by just porting and polishing the head of a b18c. The pistons are made to withstand 10,000rpms, whilst being lightened. The rods are much lighter than normal B18c rods, and are strengthened. The valves, valves springs and retainers are all made from lighter material and specially coated similar to that of the NSX, theres plenty more but its 9am and I havent slept yet so I'll leave it at that. Someone take over, im too tired to continue.

If u gave me a choice between the LS/VTEC and a b18c stock, if both were the same price, I'd still choose the B18c.

[SpiceyTeg]

Hmm.. interesting.. i got the gsi, and money!! im keen to get this B16A Vtech head on my B18b!! who does this in Australia?