Isn't there space for the exhaust tune outside the engine bay over the wheel?
The insides look like an airfoil turned into a donut. The exhaust gasses are split, some go to the outside of the ring(airfoil) and the remainder go through the inside. The airfoil causes the gases to speed up (venturi principle). Looking into the muffler you can see straight through. T...
If I understand, you're in need of some maleable material to put inside the foam to create headers: HVAC shops have hi press & lo press tubing line sets for residential air conditioning made from fully annealed copper. I recall the sizes to be something like 3/8" and 7/8".
Big fan - McMaster is The Best! Great machine tooling, plastic buckets, on and on - unbelievable! Customer service that's first class.
There is probably room but there is no way to get the primary pipes there, they just aren't anywhere near long enough. The 6 that have to come together are the 6 on the front and the 6 on the back not the right 6 (1-3, 10-12) and left 6 (4-6, 7-9). The only place they can come together is in about the middle 1/3 to 1/2 of the engine I think. The right 3 (10-12) will need to got down and left at about a 45 degree angle staying tight to the block and the collector turning to the left at the bottom. Then the left 3(7-9) need to go down and right at a 45 degree angle following the fire wall and make a 135 degree turn putting the collector right along or over the right bank collector. Then they merge and head out the hole onver the bell housing. That's the plan anyway.....
McMaster has it too That's pretty much what vincent suggected a few posts back and what I'm going to try. I've go some soft copper and alum tubing in a few sizes left over from past projects.
Only what is posted on their website. Just a big hole, restriction has to be minimal. Sound bites are posted on their site too. T...
Youd be amazed at how little things can bugger flow all up. Like flow HATES going from small to big but doesnt much care about big to small. Youd think it would be the other way around but it isnt. I found a lot of confusing info on these particular mufflers. A few dyno pulls against stock that showed good improvement and a couple dyno pulls against other aftermarket that showed loss but none included any tuning of any kind so who knows what it means. I like the system Russ did on his car and Im really tempted to just copy it with 3 mufflers and see what happens http://www.ferrarichat.com/forum/showthread.php?t=221119
I see what you mean Mark. I like that too. Russ's exhaust note is very nice. We have been talking about flow lately on other arenas and I can see that exhaust is just as finicky as intake. I'll need to think twice about the Aero Turbine muffler for my hotrod. T...
I guess the only way to have a reasonably quite car and hp is to do what ferrari and now many other makers do.....valves in the exhaust. Big ID pipes are just loud. Maybe what I should do is go with a 3.5" tail pipe and split it into 2 .5" pipes which have almost exactly the same cross-sectional area, into 2 of Russ's set-ups and out 4 2.5" tips. Russ is making about 320hp, as 2 copies should be good for at least 640 and probably more. If it's too loud I can track down a couple valves and hook them to the ECU to close off the 2nd system at low power. The down side is it would be heavier and take more space than 1 big muffler.......
Another delay on final cam selection some kind of power grid crash and cam guy is going on vacation. In theory all the test lobe options are going to cam doctor guy by the end of this week (before vacation) so I can make a decision and grinding can begin right after vacation. Im thinking EFI car will run this weekend and be tuned and DONE next weekend and Ill be back to V12 work exclusively .finally.
A strange twist today on a pretty unimportant subject. It appears ferrari is using the 458 name on the new model. I has myself about 90% talked into using that on my car because I like the confusing meaning....my cylinders will be exactly 458cc and that is how 12 cylinder engines are traditionally designated but it also ends in 8 which normally designates an 8 cyl car making what seemed a perfect number for my car......and now it's gone
There's only one solution to this one Mark: Get out the honing tools and aim for 468!! That 120 cc extra in your engine will produce another 14 hp, so it will be for a Good Cause anyway...
Come to think of it, a 508 is a BMW. As is a 518 As is a 528 So get out a bigger drill! It's gonna have to be 538, for a total of 6.45 liters. Bummer.... (Who cares that by then your pistons will be rubbing against each other. Better than receiving a phonecall from some BMW lawer) Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Mark I've been following your exhaust deliberations and would like to offer the following: My 575 GTO special has 4 x 2'' pipes, which was the dia that our calculations suggested. This engine dyno'd at 600bhp so I think the pipes are right. If you want 900bhp this suggests that 2.5'' dia is all you need as this gives the cross sectional area +50%. We fired it up in the car for the first time today and it was not at all noisy, at tickover and up to the sort of low rpm I would use in town. We have one silencer box 17'' x 9'' on each side, and the perforated pipes go straight through. Of course it's probably going to be outrageous at high rpm, but this will only be used well away from residential areas. Basically I'm suggesting that you might try 2.5'' pipes and simple silencers and it should all work out fine. Image Unavailable, Please Login
We're talking about the same number. I've got 4 options on the table. 4 pipes at 2.25/2.5 or 2 pipes at 3/3.5. The math says the [email protected] or 2@3 is enough my only worry is the muffling and restrictions it brings. My engine is smaller than yours but I'm asking it to pump 30% more air so it is going to be much more sensative to restrictions, the same reason my TBs came out so large the difference here is the TB almost can't be too big, the exhaust can. 2@3" is the prefered answer but the bigger the tube through the muffler the less muffling it will do. I'll probably try 2@3" and just see what happens.
I had a chat with the guys at Cometic today about head gaskets. They think the way to go is a composite gasket. I just need to send them a drawing showing where I put everything and they will give me head gaskets in 6-8 weeks. Now I have something to do at lunch time for the next few days and this nagging problem will be solved.
Hans- That is a 507. Mark- You do not need any stinking X-pipes on a V12. Plenty of pulses to extract the exhaust, unlike a V8. See the discussion in the 456/550/575 forum if interested. Ferrari went to straight pipes on the 575M. Taz Terry Phillips
There is no way I could get an X in there even if I tried. I'm thinking the headers are going to be 6 into 2 into 1 on each side. Do you know what's strock on a 575 and 599?
Hmmm....that thread suggests an X pipe makes more hp and less noise. But I still don't know how I would do it. EFI car should run sat and go next week so I can get busy figuring this out.
