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  1. J

    Exhaust heat shields

    Thanks for all the replies and information. I do think some strategically placed fans and ducting will be the way to go for keeping firewall temps under control. Now I'll need to make sure the alternator is up to powering these motor room fans in addition to the radiator fan, electric water...
  2. J

    Exhaust heat shields

    The Miura bodywork has a couple of provisions for getting fresh air in and out of the motor room. For bringing air in, there's these vents at the rear of side windows, although I'm not sure how effective they really will be. And to get hot air out, what looks to be a rear window, is really...
  3. J

    Exhaust heat shields

    So now that I have the front side header complete, I put the engine back in the chassis so I can fabricate the secondary pipes. Here's the clearance between firewall and header. At the closest point, it's only a 2 1/2" gap and the seat backs are right up against the other side of that...
  4. J

    Exhaust heat shields

    So it sounds like this gold heat screen is made for keeping radiated heat out but not for keeping it in. In other words, not for direct use on the headers as it's heat rating is way below the heat from a header primary. So it might be part of the solution but not all of it. For example, for...
  5. J

    Exhaust heat shields

    I will certainly try to get the coating done inside and out. I cleaned the insides with rubbing alcohol prior to welding the headers in preparation for having the insides coated.
  6. J

    Modern-day Miura

    The primary tubes on these headers are within 1/4" length of each other. My motivation for the equal length pipes is to have the exhaust pulses smoothed out as much as possible. While it's not really possible to have a V8 sound like a V12, I'm doing everything that I know of to make it so :)
  7. J

    Modern-day Miura

    Thanks!
  8. J

    Exhaust heat shields

    I have a situation where the headers run very close to key engine and transaxle components and also close to the firewall (thus the driver/passenger seating areas). I'd like to build in some heat management provisions and am hoping there are some who've "been there, done that". The...
  9. J

    Modern-day Miura

    Header Fabrication – Second Header Completed I’ve come to the conclusion that the people who build tuned length headers for a living must be of a different breed altogether. I’ve driven myself cross-eyed with fitting together all these different radius curves, measuring, fitting, re-measuring...
  10. J

    Modern-day Miura

    Header Fabrication – Restart on Header Two (cont.) To try to avoid repeating the situation where the completed header would not fit, I decided it worth the couple of hours work to put the engine/transaxle back into the chassis for another test fit. 3 of the 4 primary tubes are formed and tack...
  11. J

    Modern-day Miura

    I've never had the pleasure of owning an original Miura so I can only speak to what I've heard. The Italians have a reputation for making beautiful sports cars but like many beautiful things, they can have their quirks. For example, until the last couple of years of production, the Miura...
  12. J

    Modern-day Miura

    Header Fabrication – Restart on Header Two As tough as it is to cut up a just fabricated part, I’m over it and busy remaking the front side header. My approach this time is to positively locate the collector position/orientation and then route the primary tubes starting at the collector...
  13. J

    Modern-day Miura

    Header Fabrication – One step forward, two steps back Given what I’d learned fabricating the aft header, I’ve been busy fabricating the header for the other side of the engine. The main difference between these two headers is that I was able to have the engine in the chassis while fabricating...
  14. J

    Shop tools

    If your car projects involve welding on odd shaped items, things like headers, door frames, fender liners, body panels, etc. here's a specialized tool I use all the time. I've don't recall ever seeing a place to buy one of these, I made this one after seeing a picture. It saves from getting...
  15. J

    Modern-day Miura

    Header Fabrication in 304SS (cont.) One header down, one to go. I welded on the double slips, collector tabs, collector extension, and O2 bung. And with the rear chassis brace in place, only bits and pieces of the header are visible. Now the engine and transaxle needs to be pulled from...
  16. J

    Modern-day Miura

    Header Fabrication in 304SS (cont.) For the aft header, it was time to complete the full welds on the primary tubes. I ground out the tack welds on the slip joints to make adjustments for the warping from the initial welding. The welding schedule I chose to use is: weld butt joints starting...
  17. J

    Modern-day Miura

    Header Fabrication in 304SS (cont.) I was warned that when SS mandrel bent tubes are welded they would warp/move often in seemingly random ways. This is even when the joints are tight and held with 4 good tack welds. I’m sure the movement isn’t random but given this is the first set of...
  18. J

    Modern-day Miura

    Header Fabrication in 304SS After completing the header mockups, I had all the information needed to order up all the necessary U bends, double slip collector, Y pipe, V band clamps, and collector tabs in 304 stainless steel to fabricate the headers. It was all delivered in one big box...
  19. J

    Modern-day Miura

    Shifter Installation I had chosen a shifter made by Numeric Racing for use in the Miura. The shifter is designed for use in Porsches so there were a couple of quirks with the install involved in converting metric pickup points to standard threaded cables. The shifter itself is very well made...
  20. J

    Modern-day Miura

    Shift Linkage Prior to fabricating the headers, I thought it smart to build out the shift linkage to ensure the space I had reserved for the linkage while mocking up the headers was actually going to be adequate. As a reminder, the custom transverse transaxle uses a Tremec TKO 5 speed...
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