Hey all. I have a 2000 Civic Si with Greddy 18g turbo. I'm currently rebuilding my blown motor and replacing the B16A2 with the B18C1 bottom end. I was wondering if the downpipe will fit correctly or will it take fabrication of the downpipe to make this work? Is there anything else I should consider? If someone here has done this setup, please let me know so I can plan ahead. Otherwise, I won't know for sure until everything is in place. I'll keep you all updated. Thanks guys!


Modified by GTurbo00 at 3:20 AM 7/9/2003

 

All b sereis vtec blocks are the same (exterior). It will fit without any mods

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by brryder &raquo;</TD></TR><TR><TD CLASS="quote">All b sereis vtec blocks are the same (exterior). It will fit without any mods</TD></TR></TABLE>

 

Are you positive? I was under the impression that the B18C had slightly different dimensions. I hope you're right though! Thanks man.

 

I believe the b18 block is a tiny bit, about 7mm, taller than a b16 block.

 

Hmm.. so do you guys foresee any problems when I put the turbo back in?

 

bump

 

True the deck height is differn't, but we aren't talking about that in this case. Exhaust ports will be in the same damn spot. It's the car not the block. If you drop a B16A2 in a GSR no you can't use the GReddy turbo kit for 99-00 Si's on it. Any B-series block you put in your Civic Si wil work just fine.

edit: and before you ask YES I'M POSITIVE.

 

I realize any B-series block I put in my Civic Si will work in terms of the car. However, my question was in regards to the Greddy downpipe. I was just worried that the height difference can cause potential problems.

I was hoping someone with this setup can tell me. Oh well. Thanks for all the info though guys. I will find out in a week once we put everything back together again. Hopefully, I was worried for no reason... but in the mean time, I guess I'll have a

 

I can't believe you haven't gotten a straight answer! No it will not fit w/o modification and yes the block is 7mm taller..I speak from experience when i tell you the dp needs to be lengthened..just enough to **** you off..

 

Damn! I had a feeling... well thanks for letting me know. At least I can be prepared for it now. Thanks again. I'll be IM'ing you.

 

Are you guys drunk? The manifold and turbo will bolt up in the exact same place on a GSR motor in an Si as a B16A2 in as Si as will on the B20/B18/B17 etc.... All the mounts are in the same damn place. I have a friend who put a built LS motor in his Si, GReddy kit bolted right back up as did the downpipe because the turbo did not change position whatsoever. Of course now he has an equal length manifold and differn't turbo, but that's another story. It worked. I don't understand you guys.

 

I'm not THAT drunk , but I'm sure BlwnBlue is most likely correct. We're not disputing the fact that the turbo will bolt on to the B16A head. However, there is a strong possibility that the downpipe has to be modified to avoid hitting the oilpan and to reach the cat, which BlwnBlue has made it clear to me that this MUST be done.

I don't know why your friend's LS motor in the Si bolted in so easily. Is there anyone that can explain this?

 

ttt

 

The Greddy down pipe will fit. But you can't fit the stock Si Header on a GSR block.
So that's why people are saying it wouldn't fit.

 

I think you guys are a little confused. If you tried bolting the 99-00 Si turbo kit or header onto a GSR CAR you would have to modify the downpipe because the cat and exhaust on a GSR are differnt. BUT you are not doing this. You are just chaning blocks. The head is still going to be in the same place, same bolt pattern and the manifold will be in the same place so that means the turbo will be in the same place so that means the downpipe will bolt up in the same place and if the downpipe bolts up in teh same place that means it will bolt up to the cat/tespipe that you are running. Oil pan clearence should not be a probelm either. Why does no one understand?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ron &raquo;</TD></TR><TR><TD CLASS="quote">The Greddy down pipe will fit. But you can't fit the stock Si Header on a GSR block.
So that's why people are saying it wouldn't fit.</TD></TR></TABLE>

Header bolts up to the head, not the block.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ron &raquo;</TD></TR><TR><TD CLASS="quote">The Greddy down pipe will fit. But you can't fit the stock Si Header on a GSR block. </TD></TR></TABLE>

Actually, there are no headers in this equation since I'm using an exhaust manifold in my turbo application. Also, it bolts up to the head much like the headers.


Modified by GTurbo00 at 3:13 PM 7/10/2003

 

Just for clarification, like me, BlwnBlue has a 99-00 CIVIC SI with a B16A2 head and a GSR bottom and he told me that he had to modify his Greddy downpipe by lengthening it.

So basically Mr. Milano thinks I won't run into a problem and BlwnBlue thinks I will. Does anyone else have some knowledgeable opinion on this. Thanks.


Modified by GTurbo00 at 6:23 PM 7/10/2003

 

BlwnBlue. Why did you have to lenghthen your downpipe? Did you just change the block or did you change the cat/exhaust/turbo manifold/turbo or something else?

 

anyone?

 

I agree with Mr. Milano

hahah it's funny though reading this. I understand what both of you guys are saying, you both just seem to be reading eachother wrong. The B18 and B16 blocks differ by 7mm (that's about 1/2 of a freaken cm)

I am almost 99.99990% sure that you can use your stock downpipe from your current setup on your B16 greddy turbo kit. YES clearance from the oil pan will be closer but only by 7mm! you will not have any clearance issuse.

The only way i can see a clearance issuse is IF in your current setup with the Greddy kit and B16; the clearance between the downpipe and oilpan is near rubbing each other therefor now allowing any addition clearance for a 7mm varyieance.

if your worried about the downpipe heating up the oil pan too much then just add a plat with ceramic heat coating between them OR/and wrap the downpipe section were it near the oil pan with heat wrap..

HTH
and stop arguing LOL jk

 

guys.. i am just saying that if you had a GSR block.. with any vtec head, your stock Si header will not fit. Thats why some people are saying the greddy down pipe might not fit.

The Greddy down pipe will fit. I've done it twice. I am willing to put money on.

Geez, sorry I couldn't communicate well, but I figured you guys know that header bolts on to the head and if you got a turbo, you not going to have a stock si ex mani on your car.

 

Wait let me get this straight. So your saying if I have a BONE STOCK 99-00 Civic Si and the only modification I do is change from a B16A2 block to a B18C1 block my stock exhaust manifold won't fit anymore? Riiiiiiight. No one has given reason why it will not fit yet. Someone please explain to me why the hell you would have to lengthen the downpipe? I think you guys are missing the point.

 

Umm actually the reason has been stated numerous times already. If you still haven't picked up on it then I don't think telling you again would help.