Down under, an idiot and a 400F

[crazypj]

Did you photoshop them to look shorter?
Looks a lot better with the CF lining up on tyre
I think seat tail needs to be 'bigger' to balance out (probably longer?)
I was going to do dual on 378 but two RMZ silencers, even if cut shorter, just look overwhelming (may not be quite so bad when everything else is done)

 

[neevo]

Yeah that second one was photoshopped shorter. I will play around with them a bit more and see if I can get them looking better.

 

[crazypj]

Try to get lighting higher so the angles on silencer show up.
It could just be they look huge because of 'flat' side on lighting? (put something dark under the bike to cut down light reflected from floor)

 

[neevo]

Try to get lighting higher so the angles on silencer show up.
It could just be they look huge because of 'flat' side on lighting? (put something dark under the bike to cut down light reflected from floor)

Good point, they were photographed in a dark garage. Once I have some basic mounts mocked up, I will get the bike outside and take some more piccies.

 

[crazypj]

Haven't done any 'real' photography since the mid 80's, but, I aint forgot everything - yet ;D
Just got a couple of flashes with slaves from eBay, even a 'point and shoot' will work pretty good with different lighting angles (and cheap coloured gel on slave flash )

 

[neevo]

I've got an SLR here with some slave flashes so could photograph it that way if required. Nothing beats some afternoon glowing sun though (need to make sure I don't force a good look with flashes). Had another crack at some different angles and placements to see if it gets any better (standard length muffler only).

1. Pulled in towards headers a little further to get carbon piece on tyre
2. Adjusted angle to match subframe and also pulled in to get carbon on tyre

 

[crazypj]

It's growing on me 8)
Seat is now looking too small rather than silencers too big : ;D
Just realised, it's angular exhaust with round seat
I think couple of slave flashes high up front and rear (without getting too 'artsy') would look good Orange or yellow gel? ;D ;D

 

[neevo]

It's growing on me 8)
Seat is now looking too small rather than silencers too big : ;D
Just realised, it's angular exhaust with round seat
I think couple of slave flashes high up front and rear (without getting too 'artsy') would look good

Don't be fooled too much, they are farkin' huge exhausts too

 

[crazypj]

I like the angle you have them at now
I have a single side exhaust for GSXR1000 from 2008 or so, it's pretty big but I was going to use it on Katana if I ever get round to building 1100 motor

 

[spotty]

i'm wondering whether they'd look better running on the same angle as that nearest frame rail (the one from the back of the engine diagonally to the seat hump), it might look neater and tucking them up against the frame more might disguise some of their bulk????
or alternately, lose the mid pipe bit and attach where them about where the rear sets are going to be, using the bracket on the muffler as its situated now so the muffler is in a straight line with the bottom of the motor

just a thought, taking into consideration it was 44*C down here today and i have had several beers at this point of the evening

 

[andycafe]

I definitely like this new position, I was thinking last night I wonder how this would look 8) I think the lines work great and the rear wheel doesn't seem to be hanging out the bottom now

 

[jungalist]

fuck the lines, mount them upwards. it looks way better imo. horizontally would look good with classic exhausts, not with these.

 

[VonYinzer]

Just a thought... Do you know what the optimum header length is for your bike? (Sorry if I missed that earlier)

I ask, because the setup looks long to me. I think it would look badass with thw can coming almost directly off of the headpipe on an angle, in front of the rear tire. MotoGP style, if that makes sense. Keep the visual weight towards the center of the bike.

 

[neevo]

15" apparently. But total length of 60". Might have got the calculations wrong though.

15" header length seems wrong to me as that's not even reaching under the motor.

 

[crazypj]

15" seems real short to me as well. I haven't done any math on it but last time I did exhaust pipe calculations for a 250cc/cyl @ 8.500rpm the pipe length was 26" (exactly the same as the OEM pipe length)
Are you using 'race' cam timing or stock Honda?

I ask, because the setup looks long to me. I think it would look badass with thw can coming almost directly off of the headpipe on an angle, in front of the rear tire. MotoGP style, if that makes sense. Keep the visual weight towards the center of the bike.

Realistically, Moto GP exhaust works because motor is spinning at 17~20,000rpm, at 8K it needs to be substantially longer to work properly.
The 1990's Ducati under seat exhaust wasn't just a styling exercise but to get total exhaust length
Buell use 'short' exhaust, looks pretty ugly in most peoples opinion

 

[neevo]

What is the BBBC or whatever that measurement should be called for the 400F?

Currently I'm using 54 I think from memory.

 

[crazypj]

Are you talking about exhaust valve opening and closing points?
It's actually better to measure them at 1mm valve lift with a degree wheel on crank

 

[neevo]

I used Sonriers equation from his link:

"Now that we have our pipe sized correctly, it's time to get the length of the header. The calculation for the length is fairly simple. Length, in inches, is equal to (((850 * (180 + EBBC)) / RPM) - 3. EBBC is the number of degrees before BDC that the exhaust valve opens. In my own engine, this number is 54° and so the calculation becomes (((850 * (180 + 54)) / RPM) - 3. Unlike other RPM selections, the RPM value used in this calculation should either be the redline of the engine, or the midpoint between peak torque and redline. I'll be using my redline of 11,000 RPM. Working the math through gives us an ideal primary header length of 15.1 inches. Should you ever arrive at a length of less than 15 inches, just go with 15. You don't want these things too short."

I didn't have an EBBC value for the 400F so I used 54 instead (which is what Sonrier used). Is this correct for the 400F or should I rerun the calculations?

 

[crazypj]

I'll see if I still have numbers for stock cam although I'm pretty sure you should be in the 20"~28" range for primary pipe

 

[crazypj]

Couldn't find 400 info, did find 550f 1. Piper 'fast road' cam opens 70 degrees BBDC, close 30deg ATDC (revs to 13,500)
Stock, 30 BBDC 5 ATDC
Both at 1mm lift
No idea where you got 54 from?