B18c6 turbo questions


charliekydd

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Sep 18, 2017
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okay here it goes

I own a Honda Civic eg 1994 which is in great condition, In the bay is a b18c6 engine also been well looked after. I have ordered a turbo kit (it's on its way) for the eg and feel as if I have made a massive mistake! I have done some reasearch and didn't see a lot of hassle/problems with turboing this engine. I have had a few people ask me am I going to lower the compression? I'm looking to run around 10-13 psi, not looking for loads of boost and wanna make it Around 300bhp. So the question is do I need to lower the compression? I have also seen on this forum that people are saying don't turbo the c6 do the c4, I have done research on the c4 but it's all too late now. Hoping someonere here and do some explaining as I say I feel as if I made a horrible mistake, thanks Charlie

•do I need to lower compression to turbo my c6

• Am I safe running 10-13 psi?

• Is there anything else I should consider?
 


EK9 Matt

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Hi there mate, unfortunately I'm going to give you news you don't want to hear lol.

I wouldn't turbo the C6 for a few reasons...

They're a high comp motor, ideally you want a lower compression ratio when going turbo'd. It can be done but I wouldn't run nearly 1bar on a C6.

Also the valvetrain, the type r valves were thinned out near the valvehead to save weight and also flow better, they're not that strong though, I've had dropped valves NA, nevermind boosted. People do run the type r valvetrain and on high hp applications with high success, to me it's a ticking timebomb though.

Possibly the best reason in your case is a good C6 is worth decent money! You could sell the C6 and buy a C4 motor (which is lower comp and good for 350bhp stock!) For less than half the price!

Hope this helps mate.
 


jesse888

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Ive seen 300 on a c6 but id imagine its pushing it abit as far as the compression goes.
Also i wouldnt get too hooked up on the boost pressure, the turbo you have will decide how much pressure it needs to make your 300 goal.
As for the valves themselves id agree with matt assuming either big boost(like 1.5+bar) or a stronger valve spring is used then id want them changed.

The internet will tell you lots of things, but i think youll either make or come damn near your 300hp goal. I made 280hp on a standard b16b(also high comp).
 


EK9 Matt

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As Jesse says you'll piss 300bhp, just not the ideal motor to do it on that's all.
 


charliekydd

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Sep 18, 2017
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Honda Civic eg b18c6
Hi there mate, unfortunately I'm going to give you news you don't want to hear lol.

I wouldn't turbo the C6 for a few reasons...

They're a high comp motor, ideally you want a lower compression ratio when going turbo'd. It can be done but I wouldn't run nearly 1bar on a C6.

Also the valvetrain, the type r valves were thinned out near the valvehead to save weight and also flow better, they're not that strong though, I've had dropped valves NA, nevermind boosted. People do run the type r valvetrain and on high hp applications with high success, to me it's a ticking timebomb though.

Possibly the best reason in your case is a good C6 is worth decent money! You could sell the C6 and buy a C4 motor (which is lower comp and good for 350bhp stock!) For less than half the price!

Hope this helps mate.
Wow I was sweating when reading this I knew it was a mistake. Either way it's on it's way and there Is not a lot I can do for now. Thanks for messaging back matt is there anything you can advise me to do?
 


charliekydd

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Honda Civic eg b18c6
Ive seen 300 on a c6 but id imagine its pushing it abit as far as the compression goes.
Also i wouldnt get too hooked up on the boost pressure, the turbo you have will decide how much pressure it needs to make your 300 goal.
As for the valves themselves id agree with matt assuming either big boost(like 1.5+bar) or a stronger valve spring is used then id want them changed.

The internet will tell you lots of things, but i think youll either make or come damn near your 300hp goal. I made 280hp on a standard b16b(also high comp).
Thanks for your reply Jesse, I'm not to clued up about the valve spring job but I know that the engine has had a skunk2 stiffer valve spring? Was told this was something to do when vtec kicks in? Again thanks for messaging and thanks for your info,
 


charliekydd

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Honda Civic eg b18c6
MYonly other questions for this build are,

What size do you drill the sump?

And does the oil feed line go into the oil pressure sender unit on the back of the block

Thanks guy
 


jesse888

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Thanks for your reply Jesse, I'm not to clued up about the valve spring job but I know that the engine has had a skunk2 stiffer valve spring? Was told this was something to do when vtec kicks in? Again thanks for messaging and thanks for your info,
Im not a fan of running standard type r valves with a stiffer valve spring. For the exact reason matt mentioned above, imo you should match all valve train components together. So you either upgrade them all or not at all.

T-piece into oil pressure sender is an option for the feed yes.
 


charliekydd

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Okay thanks for your help Jesse looks like I got a bit more research to do then
 


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