Hiya guys,
I've been to look at a EG4 VTI today. I really like the look of it and I'm considering buying it. The only thing I'm not sure about is the engines a B18C4 (UKDM similar to the B18C - none type-r 169Bhp stock) running B20 crank and rods. The owner says that this gives it 1834cc and 11.6-1 compression ratio. Is this a safe and tried combination? I don't want to buy this and have major engine issues.
Other mods include ITR cams and fly on chrome ECU. Estimated power is 200Bhp.
Apparently the engines done 2,000 miles since the rebuild and has been fine so far. They guys who built this engine and fitted it into the car are known in the UK and have some really fast hondas under there belts.
I've asked about this on a UK forum but the guys on there are pretty clueless about this mod and its effects. One guy did mention though that the rod angles would be unsafe and the compression is a little high and that it wouldn't rev as high as a regular B18C4. Please set me straight because I can't afford to buy this and have any major engine issues.
Thanks!


Modified by 205mi16 at 11:12 PM 9/24/2007

 

The b20 shares the same crank as our non-vtec 1.8, the B18A/B, used in all of our non-vtec integra's. It's actually pretty common for someone to swap in that crank and rod combo to squeeze a few extra cc's out of the engine.

The rod/stroke ratio is a little overrated, and pretty much thrown out the window if arp rod bolts are used in a balanced bottom end.

 

Thanks for the reply. Sorry - what do you mean by the rod and stroke ratio are thrown out of the window?

Can anyone else give more info or confirm if this is ok to do? as I've mentioned, I don't want to buy this car and have trouble with.

I'd love to hear from anyone whos does this before?

I need to be certain that this is safe before I buy.
Cheers!

 

As far as the rod/stroke ratio, I meant that when a properly built bottom end is used (A balanced rotating assembly, strong rod bolts, etc) that the R/S can be almost ignored. This doesn't mean the thing will want to see 10k rpm, but it "should" be much stronger than the stock B20/B18 bottom end, if it was built properly.

If this is a stock crank with stock rods and bolts in a B18C, I personally would stick to the stock B18A/B20 redline.

 

I've done a quick search and found that the B18C4 stroke is 88mm, the B20 stroke is 89mm so its only a 1mm difference. Also, the pistons in this engine are the B16A2 items. As far as I know, the B16A2 and B18C4 pistons are both the same - 81mm. But, doesn't the B16A2 run more compression than the B18C4? So this woud suggest its quite a safe combination as long as its been done correctly. The engines covered 2,000 miles and seems sweet as a nut!
I think I'm going to go for it!
Please correct me if I'm wrong?

 

as long as the engine is correctly tuned you wont have problems with the compression

 

As it is its running a chrome pro ecu mapped with wideband. Would it be worth having it rolling road tunned or woud this be ok?

 

Do you have access to a dyno?

 

Not personaly but there are a couple near by. I could get it booked in. I'm tempted to just for piece of mind.

 

If the engine hasn't been Dyno tuned then I would jump at the chance.