i am going to be building an engine soon and i amentertaining a few thoughts

i amgoing to stay n/a and i want to have fair streetability and have a good strong engine that is reliable

in theory the gsr block has a better rod to stroke ratio and better cooling and strength characteristics that a ls block (ie. oil squirters and block girdle)

i amlooking to beuild a NON-VTEC that is capable of
revving high. i will be using crower 404's and a well
ported head. i am curious of the benefits of using a
gsr block with a ls head would be compared to a straight ls

i am doing this on a budjet and i was seriously entertaining the idea of adding oil squrters and block girdle to my ls block, but now i am thinking of using a
gsr bottom end in conjunction with a ls head

maybe even putting in my ls crank into the gsr block
i will be using pr3 pistons

 

The man advantage to this idea in terms of NA that I can really see is the cost of the LS head vs the B18C/B16.

By using the GSR crank and rods, you are removing the extra displacement and altering the piston dwell time, both are what makes the LS/vtec desirable in terms of torque.

If you were to use the GSR bottom end, yet keep the LS rods and crank, you would keep the rod/stroke ratio and displacement, yet have the added protection of a block girdle and oil squirter's.

However, as you said, the piston side loading is not best for high reving unless you have the money to really build the block.

The 404s are very similar to ITR cams, so if you were able to get the head to flow as well through a P&P job, as the ITR head, you could essentially have a vtec-less ITR type engine.

The difference between a B18B and a B18C block with a B18B head (assuming the heads were the same on both blocks), the B18B would have better low/midrange power, yet the power-band would die off in the higher rpms as the cylinder filling would drop off due to the piston dwell time.

 

also if you add the ls crank to the gsr block... it makes it a ls anyways (poor rs ratio)

 

You can do whatever you want but I really don't see the point... Okay, you're building a high reving motor so you wanna use a B18C bottom end and I can understand that cuz it makes sense... What I don't understand is why you prefer soooo much to stay nonVTEC... You also say talk about strength within the B18C's bottom end but the LS crank is weaker than the B18C/5/R (not that you'll ever have to worry about this NA)... The displacement factor isn't that much and the 0.04:1 change in your rod ratio from 1.54 to 1.58 isn't going to affect reving all that much... It doesn't sound like you're building a crazy NA setup so why not just go with an ITR motor or something... I'm all for VTEC motors so maybe this is where we differ but think about it, it was designed for a reason... If you want a nonVTEC setup still, I would just stick to the straight LS motor, tossing your PR3 slugs in there... I'm confused, just my $0.02

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">
LS crank is weaker
</TD></TR></TABLE>

How is the LS crank weaker?

 

It's just not a VTEC crank, ever compare the two side by side?

 

No, I haven't had the privilege. Do you have pictures? some descriptions? any other information?

 

Yea, I'll take some pics as soon as I get time... The B18A/B, B20B/Z to B18C1 has a bigger difference than you see between the B18C1 and the B18C5/R... Don't get me wrong here, the nonVTEC cranks still handle the power just fine, it's just the B18C rotational assembly is built to be stronger... Forgot to mention earlier but how is the cooling better on the GSR? (Water jackets still have the same design and the nonVTEC water pump actually moves more water/coolant than a VTEC one does at the same rpm)...

 

The oil squirters are aimed at the bottom of the piston, to help cool them. Most people think they are for lubrication, but they are not.

 

My bad, didn't really read that, "(i.e. oil squirters)"... I assumed he was talking about water cooling... As for oil squirters, don't like them either... All they do is unbalance your rotational assembly too...