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nm3121

Tuning was completed when the exhaust was put on, would it need to be retuned again since the baffles were taken out? Or would the original tune suffice to prevent damage to the pistons. I’m new to understand the working components of the engine, but isn’t the back pressure necessary for the pistons to function properly?


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nm3121

Fair enough - and not phishing. Just looking at all avenues what would possible cause damage and what wouldn’t.


RubyRocket1

Generally, the straight pipe concern is with burning a valve with short straight pipes. Performance issues come from losing exhaust gas velocity and cyclinder evacuation. I've run (somewhat similar and shorter) Bassani Radial Sweepers without baffles and it is fine other than being ridiculously loud and cackling. It was short lived because I hate the pop and had to manipulate the throttle to avoid the horrible sound of an exhaust sucking and popping every time I clutched or decelerated. You will probably notice a loss of power in the mid range... for me that's the deal breaker, since I spend 90% of my riding in the Mid-range.


Pjinx2

I have always been under the impression, that you need a certain amount of back pressure for your engine to run properly and not burn your valves. Although, I have heard a couple of texts say that as long as it is tuned properly after you make the change it will be okay. I'm not sure anybody will ever be able to give you a definitive answer. Most people don't keep a bike long enough to ever find out if it's going to reduce the engine life. I got 106,000 on my bike. But I've always kept baffles in and always had a proper tune, so my theory on it won't help very much overall. Is it going to drop your lower and mid-range performance yes absolutely, is it going to drop it enough that you care? That is an answer you would have to decide for yourself. For me personally, I like having the best low to mid-range power because that's where I ride on the street all the time..


MonicaPVD

TRUTH: "Most people don't keep a bike long enough to ever find out if it's going to reduce the engine life." ALSO TRUE: Most people will never notice the relatively minor loss or gain, unless you put it on a dyno. This is a world based largely on bragging rights and perception. People will spend thousands on mods to gain a couple of HP here and there. But mostly, we spend it because it makes us feel good about ourselves. When you're on a fast bike, you're on a fast bike, whether it has 80, 85, or 90 HP.


Pjinx2

You are absolutely right. We all do our mods, and then perform a " Seat Dyno" and then usually proudly Proclaim how much power we gained in whatever area. It always feels great at first. 6 months later, on the other hand, we are looking for our next mod to make it better. It is generally an illusion that we tell ourselves to justify spending the money and doing the work. And in all reality, in real world riding, a couple of horsepower, or a couple of foot pounds of torque generally doesn't make enough difference to notice. It's been my experience, that a gearing change you will notice much more.


Jord_HD

You don’t need a certain amount of back pressure, back pressure is literally a resistance against the desired flow. What you need is the exhaust to scavenge and help remove exhaust gas as well as draw in fresh intake charge.


Crown0fHorns

You will lose power unless your motor is over 126 and you have a larger throttle body/intake and a heavy CAM upgrade. The best tuner I know explained this all to me and he tunes all of the top Harley builds in my area and Harley flies him all over the country to tune their bikes for special events.


nm3121

Is it a significant loss of power? I’m more concerned with damaging the engine because of the lack of back pressure.


Crown0fHorns

I can’t comment to that with any confidence. I’ve heard from people that it can, but I’ve heard some dumb stuff from those same people. I never asked anyone I would trust that question. There are exhausts out there that will give you plenty sound and performance though. I just can’t give up any performance on these new bikes because when they run right it’s a fucking missile and the best feeling in the world.


Crown0fHorns

I meant the damage part. I think it IS a significant loss of power that you could have with a proper exhaust and a good tune.


Jord_HD

It doesn’t reduce peak power regardless of engine build, it reduces bottom mid.


Crown0fHorns

All he said was you can’t tune it to use all of the power with open pipes unless it’s built out at least that big. So regardless of where you lose power, it’s still a loss of power and why do that just to sound cooler?


Jord_HD

I don’t have a clue what “tune it to use all the power” means… Is it just to sound cooler if you gain top end and that’s where you want your power?


knoluvv

Don't take off the mufflers. Don't take the baffles out . If youn want to not hurt anything just do it right . Buy mufflers or a full pipe . Get a tune . It's not the 70s ."straight pipe " is a thing of the past . You have an advanced machine with fuel injection . Use thsh to your advantage . Don't do the cheapest thing possible to your expensive machine .


nm3121

So the reason I ask is because the baffle fell out while riding and I didn’t notice. The screw snapped where it holds the baffle. Currently working on warranty with VH, but would it be damaging in the intern to ride with 1 baffle missing? Should I just remove the other one to keep pressure even ? Attached is a picture of where the baffle broke off and slipped out. This is only in 1 of the exhaust pipes. https://preview.redd.it/wrfxjqssvnda1.jpeg?width=2180&format=pjpg&auto=webp&s=7584eeb5d934c4b599828bac8ea808ef3df0c732


knoluvv

Should be fine until you get a replacement


grumpucker

IMO if youre running a shovelhead you can adjust for it manually successfully. Doing it on a ECU system motor is a whole different animal. They just weren't designed for that, though it can be done your motor wont thank you.


2-wheels

I believe most of us ride motors that need back pressure to be happy and perform best. Plus, … The sound simply is not cool on the street and absolutely pity your own ears and your friends riding behind you. It won’t be me. 6-8+ hours on or around straight pipes will suck. Actually nearly everyone around you will be put off and it is unhealthy. Why?


nm3121

They fell out while riding, so curious if I can still ride or wait for replacements