Author Topic: Invanising and Exhaust (Read 7732 times)

Dead Eye · « **on:** 18 October 2013, 05:07:19 pm »

Tried doing a few searches and couldn't find anything specific so here goes;

Does removing / inserting the baffle on an aftermarket exhaust make any real difference on an Ivanised bike... I wouldn't have thought it make too much difference if any, but Mr. Exupnut has got be thinking now after a conversation we had...

Andy FZS · « **Reply #1 on:** 19 October 2013, 10:11:52 am »

Tinkering already. ..

shrekster · « **Reply #2 on:** 19 October 2013, 11:16:06 am »

My last fazer had the full monty with standard down pipes and an Akrapovic silencer with removable baffle. I felt it was noticably quicker without the baffle in place.
Jim.

Exupnut · « **Reply #3 on:** 19 October 2013, 12:50:30 pm »

Interesting shrek.... I thought it woz the other way round although i'm not totaly sure. On my bike I've got a sp engineering stubby and i know they test them @ the factory with the baffle out. For instance my pipe gives 4-5 bhp mid and about 1 bhp top. I chose it because it looks and sounds better than kosmics and my insurance states any more than 5bhp topend is a performance upgrade so more to pay. But....i had it tuned with the baffle in. I thought there may be an issue with consumption and if i run it without the baffle the loss of back pressure must affect the power? Can anyone explain it?

Hedgetrimmer · « **Reply #4 on:** 19 October 2013, 01:00:58 pm »

When I fitted my Scorpion can before Ivanising, I noticed a definite performance improvement when the baffle was removed. Since Ivanising, I haven't refitted the baffle to see if it changes much. I've always looked at the induction/carb/exhaust as a single set up and believe if you change any one part, the rest ought to be altered to match FOR BEST RESULTS. Which doesn't mean it's always absolutely necessary. A freer flowing exhaust (well designed) means better scavenging, and I think can also help to draw in the next charge from the carb side. The full monty set-up really needs an effective exhaust to work at optimum from what Mike has told me, due to up-jetting and air box mod. I would guess that fitting the baffle would reduce this effect somewhat, but TBH, I've been reluctant to mention anything on this thread when there's someone as knowledgeable as Mike around!

Exupnut · « **Reply #5 on:** 19 October 2013, 01:19:22 pm »

I suppose its also about how u want it set up. I'm lookin for good mpg but standard ish power and i spose the original can is best for that but it's foc-in ugly so new can baffle in tune up and 200 miles per tank. ( medium riding). Any change in miles per tank since mike unfarted it for u?

Hedgetrimmer · « **Reply #6 on:** 19 October 2013, 01:40:11 pm »

I found my Scorpion with baffle in gave almost identical results as the standard can, but much lighter and looks better.
Haven't really noticed fuel consumption alteration since Ivanising, but I don't really look that closely anyway. If the bike needs fuel, I feed it!

PieEater · « **Reply #7 on:** 19 October 2013, 02:30:58 pm »

When I had my bike dyno'd I asked them to do a set of runs with the baffle in and out of my Fuel end can.
Baffle in - power 127 / torque 71.
Baffle out - power 134 / torque 74.

From the graphs both torque and fueling delivery are better with the baffle out, and the bike definitely feels fitter.

/Edit - Forgot to confirm bike is Ivanised (Full Monty).

Dead Eye · « **Reply #8 on:** 19 October 2013, 02:45:11 pm »

That seems fairly definitive... and also quite helpful in particular for me since I have a Fuel end can on mine as well haha

The baffle is definitely staying out now ^^

noggythenog · « **Reply #9 on:** 19 October 2013, 02:52:46 pm »

I dont see the point in doing any upgrades to a Blue bike......they will always under perform!

Exupnut · « **Reply #10 on:** 19 October 2013, 03:41:37 pm »

Flagged as inappropriate

old son · « **Reply #11 on:** 19 October 2013, 05:29:46 pm »

Will a short exhaust be any difference to a longer one? Some of the longer ones stick out past the number plate!!

Tmation · « **Reply #12 on:** 19 October 2013, 07:44:58 pm »

Basically a bigger end can (more internal volume) allows you to run a straight through exhaust without really excessive noise. The small end cans will make similar power with the baffle removed but will lose out to a larger can with the baffle in as the baffle needs to be more restrictive to keep the noise down.

Assuming you are keeping the standard headers the length of the mid pipe also affects where the power is made. The longer it is the more you loose at the top and the more you gain in the mid range.

Horses for courses really, decide on looks / power and where you want that power, how much do you want to pay, how much noise do you want to make etc etc.

I haven't seen any test recently, but the small cans fully baffled to meet noise regs can actually lose a fair bit of power.

Exupnut · « **Reply #13 on:** 19 October 2013, 08:08:51 pm »

Ok.... That sounds good. Mr Crisp recently had his bike touched by the Falcon and so has mr kosmic. Mr Crisp has the baffle out but mr kosmic runs his bike with the baffle in. I wonder why. I will be takin the baffle outta my bike.....wake up London :-)

red98 · « **Reply #14 on:** 20 October 2013, 08:23:17 am »

i find with my non ivanised bike with scorpion end can,baffle out, you get a lot more power higher up the rev range and less low down ,pulling away etc....but its rough low down when filtering.....with baffle in its similar to standard but weighs a lot less....i dont like the flimsy build of the scorpion,and have the standard on most of the time........think this is how most after market cans work , moving and increasing the power higher up the rev range suited to fast A roads and track days.......just my opinion of course

Dead Eye · « **Reply #15 on:** 20 October 2013, 08:55:49 am »

Yeah, I think I experienced that a bit - it does feel a bit more rough at sub 3k rpm with the baffle removed. Can't really comment on the top end as it's so easy to just click up a gear when riding that I tend to be in 6th a lot of the time at the moment :P

I spent most the last "lofo" ride in 3rd on the 600 $:\$

sadlonelygit · « **Reply #16 on:** 20 October 2013, 10:07:54 pm »

The biggest restriction in the exhaust is the exup valve. Changing the end can has the best effect by increasing the power/weightratio. You can mess around all you like with unbaffled cans but all you will acheive is holes in the fuelling. For proper gains a decent 4-1 is needed

PieEater · « **Reply #17 on:** 22 October 2013, 05:24:29 pm »

Here's the actual evidence, you can interpret it how you want. I see a 5.5% increase in BHP, smoother fuelling and delivery with the baffle out and that's what I experience when riding the bike.

Hedgetrimmer · « **Reply #18 on:** 22 October 2013, 06:05:08 pm »

Yep, definitely feels stronger at the top end with a properly developed can, baffle out. These companies don't waste all that dyno time just for the hell of it.

Captain Haddock · « **Reply #19 on:** 22 October 2013, 08:33:17 pm »

Just ivanised (SO kit) and think the mans a god! Bike is happy at 15-20mph in top gear and still picks up smoothly, even more fun thrashing through the gears, a happy bunny indeed!

Still running stock can and need a change, like oval stainless and not too long.
Currently looking at Fuel, Simmi, & Hawk, any opinions appreciated as to which to go for, I believe they're all made in UK so thats a plus to me.

PieEater · « **Reply #20 on:** 23 October 2013, 07:05:29 am »

I'm happy with my oval stainless Fuel can, the noise isn't too bad with the baffle out. They now do a range of sizes and I'm guessing the shorter you go the more noise you'll get.

keithfzs1000 · « **Reply #21 on:** 23 October 2013, 09:02:19 am »

http://www.ebay.co.uk/itm/250948023168?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

will alter it to the length you want and hand made delivered within 4 days sounds lovely and do ovals

Captain Haddock · « **Reply #22 on:** 23 October 2013, 07:58:29 pm »

Yeah the Simmi's got me, ordered at 375mm long.

Exupnut · « **Reply #23 on:** 24 October 2013, 01:22:00 pm »

Hi mr PieEater, could u explain the graphs u posted please and wot the different colours represent. I know its a dyno chart but i never understood them. Cheers :-)

PieEater · « **Reply #24 on:** 24 October 2013, 05:35:55 pm »

Quote from: Exupnut on 24 October 2013, 01:22:00 pm

Hi mr PieEater, could u explain the graphs u posted please and wot the different colours represent. I know its a dyno chart but i never understood them. Cheers :-)

Each coloured line represents an individual run on the dyno. The top chart shows 3 unique runs with the baffle fitted - the average of the 3 is 125.93BHP. The air/fuel chart shows a dotted red line which is the supposed optimum ratio, the same 3 runs are plotted on this chart with the colours corresponding to the power chart. Where they are under the line the mixture is lean, and over the line it is rich. The middle chart shows another 3 unique runs with the baffle removed the average is 133.97BHP, the air/fuel chart is unfortunately not to the same scale but to my eye it is a lot smoother with less fluctuation between lean and rich. The 3rd chart is a combined report of the 6 individual runs, unfortunately the air/fuel chart is too small so is confused but the Torque chart clearly shows the 3 runs with the baffle out on top (more torque) and the baffle in underneath (less torque) and again to my eyes the charts show a much smoother delivery of power with the baffle out.

Hope that helps.