Engine Build Up - GSR vs. LS/VTEC

[Platapus75]

I am completely building up a B18 block and a B16 head. Ive got the B16 head and a GRS tranny, but Im going to have the option of either the LS block and turning it into the LS/VTEC, or use the GSR block. I am torn between the two and am hope that someone can steer me in the right direction. Which will put down more power? Which is more reliable? Which will be able to withstand 10,000 rpm? Mainly plan on using it for freeway and track. Any help is apprieciated. Thanks

[turboEKhatch]

Both blocks when built will handle 10K RPM's, but it's about 95% likely that your motor will not make power to 10K RPM's.

If both are available to you, go with the GSR block. You don't have to fiddle with external oil feeds, or dowel pins. The torque difference between a GSR and LS crank is miniscule at best, it makes for a difference of about 20 CC's, and maybe 2 ft-lbs of torque.

[Kven]

ditto...go with the GSR block

[h22meangreen]

bump that. i say go ls vtec. you could have the best of both worlds. i could be wrong but i would use ls block gsr internals and gsr tranny.

[Kven]

Originally Posted by h22meangreen

bump that. i say go ls vtec. you could have the best of both worlds. i could be wrong but i would use ls block gsr internals and gsr tranny.

itll be simpler to put a LS crankshaft and rods into a GSR. GSR lower internals into a LS block=GSR shortblock that says B18B instead of B18C1.

[duffman868]

just use the gsr block because you dont have to modify the head or theblock or deal with external oil lines. dont listen to h22

[Severity]

more like 37cc's/2 cu in and 6 ftlbs

[jcrx]

GSR block has poil squirters and block girdle. If you put LS crank and rods in you have to machine the crank to clear the squirters. If you're doing no real modification to the block...go with a GSR block. But fi you use a B16A head on an otherwise stock GSR block, you're going to lose power, as the GSR head has smaller combustion chanbers which give it a higher compression with it's native head.

[turboEKhatch]

Originally Posted by Severity

more like 37cc's/2 cu in and 6 ftlbs

A 2% increase in displacement doesn't equal a 5% increase in torque

[Platapus75]

I dont plan on using any parts from other engines...this build up is going to have the crank knifed whether its the ls or the gsr block, arias pistons and eagle rods...plus the cylinders are going to be sleved and the head is going to have a full port and polish job done with titanium springs and retainers...im just trying to get a feel for the majority to decide which parts i gotta start looking for...

[jcrx]

IMO if you're going to do all that internal work, why don't you start with something with higher displacement such as a B20B/Z?

[Kven]

well hes going to sleeve it so he can go with a 84mm bore and just throw the B20 pistons in there(or get some higher-compression ones). at Import Builders its $100 more to sleeve the B20.

[jcrx]

Right, but if he starts with a 84mm bore, he can sleeve and go bigger

[turboEKhatch]

Originally Posted by jcrx

Right, but if he starts with a 84mm bore, he can sleeve and go bigger

It's irrelevant what size of motor he starts off with. The tops of the sleeves are cut away, the bottom is used as sort of the lower framework for the sleeves, and then they're pressed in. Aftermarket sleeves are the same for all B-series, save for the B16A and B17 motors which have a shorter deck height so they use a shorter sleeves, and also not including deck plate motors. If you have a B20 sleeved to 84mm by say Exospeed your motor has 81mm sleeves pressed in and they're bored to just under 84mm so your machine shop can hone them to the tolerances they prefer.