Need Exhaust Ideas for 86 VFR700

I'm looking for some exhaust ideas that won't break the bank, preferably under $200.

The stock bike has twin mufflers set up for flowing 350cc each (roughly).

I was thinking of buying a Delkevic polished stainless muffler for $150 shipped.



These Delkevic mufflers flow more air, so one muffler is all you need for a 700cc engine. Plus they sound great on the 94-98 bikes which have a similar engine and a free flowing 4 into 1 design. Here is a sound sample.

[video=youtube;FLKS1sv8ACs]http://www.youtube.com/watch?v=FLKS1sv8ACs[/video]

These mufflers are a straight thru, perforated core design which means they get louder under load and quieter when cruising a steady speed plus they have a removable baffle to make them even more quieter. This is what I'm looking for.

To build this I'll need to chop up the stock 2 to 1 pipes on each side and merge them together to make another 2 to 1 section going into the muffler. I'm concerned about the uneven exhaust tube distances you get when you make a 4 to 1 system.

Any ideas on building that, or on the idea in general?

 

that is a very nice sounding exhaust and for 150 thats not a bad price, i may have to get one mine is to quiet. i have a set of headers on my 86 vfr700f2 that are 4 to 1 that are great i have had no problems with them, only thing is i dont know the name of the company that made them and i have not bothered to take them off and find out. i would not suggest cutting and redirecting the flow it might cause flow problems try finding a used set of headers.

 

found this in members photos might be of some use to you
http://vfrworld.com/photos/showphoto.php/photo/30359/title/img-20130807-131139/cat/2

 

Used headers are not really an option. You can't really find them, if you do they will be rusty and costly. If you find a stainless set they will be way too expensive. So I'll probably have to make them.

I have several photos of aftermarket headers and they are all unequal length (longer on the side opposite the muffler).

Here are the 2 basic designs I've seen. One has the "opposite muffler side" primary pipes merging at the stock location (the side of the shock).




The other design extends the 2 primary pipes a bit further and merges them behind the shock.

 

I've got that Kerker setup on mine, sounds sweet. Hard to capture the sound of exhaust through video, but at lower revs has a nice V8 sound to it. This is mine:

[video=youtube;bVJtG9jn1Hs]http://www.youtube.com/watch?v=bVJtG9jn1Hs[/video]

Wish I could hear this exhaust in person, Hindle stealth. Sounds awesome

http://www.youtube.com/watch?v=MzC5U8-rAZQ

 

ya headers are hard to find but i feel they are worth it but on a budget then welding a custom like the ones in the picture are best if it flows above stock and dose not restrict one cylinder to much then its not a problem

 

To anyone that has a set of 4 to 1 headers, what size pipe is used from the "left side to right side union" to the muffler?

The Delkevic muffler has a 2" diameter inlet, so I guess thats what I'll use unless you guys say otherwise.

 

i will not see my bike until next week but when i get the chance i will get a pic for you

 

Try these

http://www.leovince.com/en/catalog-honda/sito_honda_vfr_750_f_86_87/327

I can get them from a leo vince distributor in the UK, so you should be able to get them in the USA.

Roger

 

Your approach is the *exact* same thing that I am planning to do this winter when work calms down a little bit.

I already have the Delkevic exhaust and a 4-into-1 rear pipe that was from an old Yosh setup for the 2nd gens. I've already chopped it in half. The next step was to take it to an exhaust shop up the street and attach both the 4-into-1 and the muffler where I want it and basically say "Connect these two pipes somehow."

I can measure the pipes sometime this weekend. Any other measurements or pictures that you'd like to see?

We ought to be able to make this happen... it doesn't seem that difficult. Whoever gets it done first can give some advice, yes?

 

Do you think the price would be even close to my $200 budget?

It sounds like your already finished. Will the muffler slip onto the header pipe or are the sizes different?

 

Hi.
I have no idea of cost in the US. We tend to pay more for things in Europe.
There used to be several on ebay.it

Roger

 

http://www.ebay.it/itm/HONDA-VFR-75...i_e_Accessori_Moto&hash=item1c39d99d0d&_uhb=1

120 euros is about 165 Dollars. They also are on a "make an offer"
Offer 100 euro
I have no idea about shipping.

Roger

 

Thanks for the tip Roger, but I'm wanting polished stainless steel or something that looks really nice (carbon fiber?) as well as has a straight thru, perforated core design. That Sito brand exhaust is just painted steel. That's what I have right now. Plus it's used ($500+ new) and they do not ship to US.

As an update on the Delkevic mufflers, I've learned that even the long ones can be quite loud and that the DB Killer baffle they use is not very effective. Maybe 10-20% quieter. So not a very big difference between it being in and out. More of a fine tune difference if you know what I mean.

I'm thinking of making the 4 to 1 header from aluminized steel and just slipping the ends over the stock 2 to 1 sections which have an OD of 1.7"/43mm. I'll cut those 2 pieces off the stock exhaust leaving about 1.5" of pipe to slip my new sections onto. Then merge the 2 pipes into a 2" pipe section that the Delkevic can slip onto. Then I'll ceramic coat the 4 to 1 section. This should keep costs low.

 

sounds like you have got the idea all sorted out. i will still get the pics of my set up in detail later this week, as well as see if i can find the brand name on it if there is one

 

I'm not sure I dig the looks of the single muffler. From behind it seems so un-symmetrical.

Ideally, I'd like a hidden muffler system like certain newer bikes have, but there is no room under the engine or under the seat to hide it. So what about in front of the rear tire under the swingarm? I found one bike where the owner fabricated one. It's super stealth and the bike looks so good without the bulky mufflers on it.

 

I also have doubts about the straight thru perforated muffler design. The magnaflow on my LS1 Trans Am is pretty quiet at idle and steady load, but on a motorcycle (that's exposed right after the muffler), I think it's going to be too loud for me. I need to find a way to make it quieter.

I think a single muffler with a 2" core is too big for my needs. That diameter has almost double the surface of the stock mufflers. That's a huge difference and is why you'll probably need to richen the carbs to compensate. You lose some torque, but gain top end power if I'm not mistaken. I'm fine with the stock backpressure and carb jetting so I was thinking of how to reduce the muffler core diameter as well as reduce the sound levels.

First off, the stock mufflers had 1" outlets in each muffler. I measured the surface area of those diameters (0.79 inch squared) and found that a single 1.5" diameter is what would match.



The 2" core muffler can be restricted is size by reducing the exit to 1.5", but it probably would not reduce the sound any. Alternatively, you could insert a pipe either 1 1/4" or 1 3/8" diameter. Then the sound waves could bounce off it and into the packing material. That's similar to the Delkevic DB killer insert.

I'm not positive what style of insert comes with the SS70 mufflers. Here are some pics I found.








I may just go with 2 of the Delkevics. The time and money I save by NOT building a 4 to 1 header would help pay for the 2nd muffler. I could cut the stock mufflers off the stock headers, weld on some 2" pipe and then ceramic coat the whole header. Then slip on the new mufflers. It will cost more, but might be worth it.

Here is an idea for a DB Killer that is a closed end pipe, but with little spirals to deflect the sound. It would be trickier to insert and remove, but I bet it would really reduce the sound for those certain occassions when you need it.

 

this is my exhaust system

 

It looks like you have a true 4 to 1 with equal length primary tubes. That's cool, did you make it yourself or was it from the previous owner?
I think all the aftermarket ones are actually 4 to 2 to 1. Your tubes look really close to the shock linkage. I wonder if the heat has caused any problems. Does it hang lower than stock, or lower than the bodywork?

 

it has melted the plastics in one place but thats because the previous owner driveway dropped it when hot, its from the guy before me so i can not find out who made it because he is dead . but i have yet to have or find any problems with the exhaust no vibrations or wear in any places. i think its a custom job but defiantly done by a pro its 3 inch pipe after it joins together and before that its all 1 inch. i may pull it off next summer and re coat it if i do i will take exact measurements of the whole system so if some one wants to remake a set like that its nearly perfect its nearly even on all lengths its 1/2" longer coming from the front to the join point