I found a 1.7 gsr swap for a good price adn was wondering if it'd be worth picking up.
I planned on refreshing it and popping in some CTR (PCT) pistons to raise the compress to 11.4:1, and popping in some ITR cams

if B18C... just the ITR cams without a rebuild.

So.. the underlying question.. which would be better... would i be giving up a lot by going with the b17?

 

Well if you know the history of the b17 and know it was treated right I would go for it. It would be cheaper to get a new transmission too.

 

doesnt the b17 have a better crank or something that gives a almost perfect rod ratio?
I know that the b17 smoothens out spikes on a hp/torque curve on a Cr/vtec

 

You're right... the b17a crank is used in conjunction with custom rods and pistons in a b18/b20 motor to yield a ~1.75 rod/stroke ratio. But a b17a crank in a b17a isn't anything special.

I think you'd be crazy to choose a b17a over a b18c. b18c is a much better choice, for the same reason you'd choose it over a b16a.

Justin

 

If you have b18c money get it but if dollars are an issue a built 1.7 will be a nice setup. Dont dick ride a B18c motor half the people that got the B18c are running a hot motor. 3000-3500 for a b18c swap complete if your lucky now do you want to spend that type or hard earned cash all at once.

 

Beats spending $2000 all at once and regretting your decision later. The B17 crank is used to destroke other Honda motors, but the engine itself is not all that great. The Honda motor with the best theoretical geometry is the B16a, and it can be had for less, but if you can afford it, the B18c is the best choice IMO.

 

B18C

 

Your right but to spend all that money at once is hard.

 

I always thought the B17 crank was used to stroke other B-series engines, not destroke. It has a long stroke, but the engine is only a 1.7 liter due to it having the shortest rods of any B-series engine. I will say the B17 is not a great engine, but it has a lot of potential. I'm just confused as to why Honda gave it such low compression.

 

The B17a crank has an 81.4mm stroke. The most common use is to put one in a B20 block to correct it's abysmal r/s ratio. You drop it to a 1.8l, but at least you can rev it. Not a bad trade off really.

 

quote:
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Beats spending $2000 all at once and regretting your decision later. The B17 crank is used to destroke other Honda motors, but the engine itself is not all that great. The Honda motor with the best theoretical geometry is the B16a, and it can be had for less, but if you can afford it, the B18c is the best choice IMO.
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I always thought the B17 crank was used to stroke other B-series engines, not destroke. It has a long stroke, but the engine is only a 1.7 liter due to it having the shortest rods of any B-series engine. I will say the B17 is not a great engine, but it has a lot of potential. I'm just confused as to why Honda gave it such low compression.
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The b17 is a stroked b16a motor. Deck height is the same. Only downfall is the **** low compression. CTR pistons boost the compression up to 11.4 ish which is nice for an all motor application.. i dont really think id be missing out on too much torque between a B18C GSR with stock compression adn a b17 with high compression

 

I like the B17 ok. It's basically a B16 with a 4.4mm longer stroke. Yeah one use is the so called poor man's ITR. Swapping the B17 crank and rods into a B16 yeilds a displacement of 1.68l and only drops the r/s ratio to 1.68. Now if you bored this hypothetical B16 to 86mm then you've got yourself a 1.9l, and it won't mind revving high either, provided your head is built up accordingly.

 

so if i used the .25 OS CTR pistons, that would also bump up displacement? By how much? This is getting interesting.

1.9L vtec that can rev? Sounds good to me. BTW, if i wanted to strengthen the rods, how would i do it? Or is it just better to get some Eagle rods that are the exact size?

Thanks for your response

 

10cc w/ .25 overbore in a B17. 1688cc total.

Well Eagle rods are very good for the money, but unless you really built the B17 NA or went FI I'd just shot peen the stock rods. They're under considerably less stress than many other rods due to the r/s ratio.

 

Think about what you're saying...

Put a b17a crank and rods in a b16a block........ you now have a b17a. Save yourself the hassle and start with a b17a which would be the EXACT same thing as you suggested, only with a different stamp on the block.


B16B: he suggested boring to 86mm in order to get 1.9l of displacement. In this case, no, you cannot use CTR pistons, as they're nowhere near 86mm.

Justin

 

I HAVE A GSR SWAP FOR SALE B18C1 PM me for details......

 

Yes we know. The problem is finding a reasonably priced b17a swap, since most everyone knows how rare they are. I already have a b17a crank & rods I got on the cheap and I have a line on a lightly damage(2 valves, 1 rod) $200 b16a1. Now just you do the math. I have yet to see a decent b17a swap for under $700, but b16as are everywhere, and many of the b17s have had their cranks removed, since this is the "rare" item.

I won't even bother commenting on the rest as it's entirely too obvious.

 

Think about what you're saying...
Put a b17a crank and rods in a b16a block........ you now have a b17a. Save yourself the hassle and start with a b17a which would be the EXACT same thing as you suggested, only with a different stamp on the block.


B16B: he suggested boring to 86mm in order to get 1.9l of displacement. In this case, no, you cannot use CTR pistons, as they're nowhere near 86mm.

Justin

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Im not trying to add anything to a b16a block... it is a complete b17a engine.

also i never suggested boring it out to 86 mm, i was talking about using .25 OS CTR pistons (available fro AJ racing). THe motor need to be refreshed anyways, so why not put in some bigger slugs?

 

I understand that YOU were talking about putting CTR pistons in your b17, however in your previous post you said:

This was in reply to TimoneX who mentioned a 1.9l motor using 86mm pistons. You can definitely put those CTR pistons in your b17, but your displacement won't be near 1.9 liters.

Justin

 

True.

This is not a common occurance.

You talk about cheap, and then you talk about rare. The crank from the b17 is the only worthwhile part of the shortblock. What makes you think the crank sells for a 'cheap' price? b17 cranks are one of the harder things to find, and buying the motor complete would most likely be a better deal than buying another b16 and finding a b17 crank and rods.

Justin

 

Agreed. USUALLY. However in this case B16B has located a reasonably priced b17 swap, assuming I understood his comments correctly, and I have a b17 crank & rod set on the way, and they were very cheap. This is unusual, but I was patient and shopped around for awhile. I'm still undecided as to what to do with the crank, but I picture myself picking up an OBDI Civic SI w/ huge miles for cheap and rebuilding it around the B17 parts, probably with 82-84mm pistons. Now tell me this won't make one sweet, cheap ride.

 

B17 84mm pistons and a big turbo. enuf said.

 

i agree...

I figured the b17 is a better platform then a b16a, simply because it gives a touch more stroke.
The one i found is available for a more then reasonable price (cheaper then a b16) It needs to be refreshed because it has high KM's on it, but it is not destroyed. there are the tipical oil leaks from the dist. seal, and oil pan, but it burns no oil, and there is not any significant lifter noise. I'd rather spend less money on something that is going to get rebuilt then spend more money on something that is going to be rebuilt.

 

Honda Vtec cranks are very well built. I'm not too worried. Besides even if the crank were damaged beyond repair, and I couldn't find a replacement, I could easily put in a B16 crank & rods. I'm not going to lose any sleep over it. If I get the mildly damaged b16a I'm looking at, I'll have $382.50 into an entire stroked B16a engine. Not exactly a huge investment.

 

as much as I love 2nd gen integras I would have to go with the b18c.
the b17 is a great engine but is known for a lack of torque and you will
find that you will have to double down shift during road races, a problem
that they solved with the b18c.