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  • Users: SammyDaFish
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  1. SammyDaFish

    Calculating rev limit

    Yeah, I understand the concept of bearing crush. What I'm referring to is InHiding's post. He mentions to take into account the bearing crush force. Since we're using the amount of torque applied to the bolt during tightening as a reference of how much force is applied to stretch the bolt...
  2. SammyDaFish

    Calculating rev limit

    How would one determine bearing crush force? I've never come across this before. Thanks.
  3. SammyDaFish

    Parallel Turbocharger Manifold Design

    Thanks Pat, knew you'd be one of the 1st to respond [thumbsup] I'd like to know why you suggest a single wastegate. Besides being easier to plumb, is there any benefit to running a single wastegate instead of two. I guess boost control would be easier also. I plan to achieve a relatively...
  4. SammyDaFish

    Volumetric Efficiency

    Czero, if you are so in the dark as to what Volumetric Efficiency is, I suggest you do a little research before trying to tackle any kind of turbo setup on your engine. I'd like to suggest a few books: Advanced Engine Technology - Heinz Heisler Forced Induction Performance - A. Graham Bell...
  5. SammyDaFish

    Parallel Turbocharger Manifold Design

    Here are some more images of a manifold with both banks combined. http://www.exvitermini.com/pics/extrsid.jpg http://www.exvitermini.com/pics/extrbot.jpg http://www.exvitermini.com/pics/tr2311.jpg http://www.exvitermini.com/pics/rt2111.jpg
  6. SammyDaFish

    Parallel Turbocharger Manifold Design

    I'm designing a parallel twin turbo setup for an inline 6 engine. I've been searching for information about wastegate placement and manifold design, and unfortunately, I've yielded few results. The car will be a street car, so maximizing power below 6k rpm is the goal. I've tried to find...
  7. SammyDaFish

    Benefits of ceramic coating chamber parts

    Pat, not on the 7M-GTE, that's the application. Possible the 1J or 2J engines as they were a little more expensive. There was a special production JDM only 7M-GTE that might have had it. I'm busy now, but I'll post more about the application tomrow. Thanks for the references so far... what...
  8. SammyDaFish

    R-12 vs R134a

    I've heard of some people talk about $700+ conversions. That, I agree is ludacris. My shop charges a few hundred at most for most jobs, depending on the time involved and if we need to replace anything. Remember that if you were to just do a conversion, you Legaly can NOT do it at home. The...
  9. SammyDaFish

    R-12 vs R134a

    A new compressor is not needed, and really, never should be unless it's physicaly bad. No reason to change it for a 134a swap. It's recomended to replace the receiver/dryer as oil tends to accumulate in it and R-12 and R134a oils are incompatable. I have seen some problems with domestic cars...
  10. SammyDaFish

    Benefits of ceramic coating chamber parts

    rmbuilder, did you happen to find any dyno results showing improvements on the coatings? Have you done business with Swain Tech? So far I've been able to find the most information on people using them, still though, no quantitative data :(
  11. SammyDaFish

    R-12 vs R134a

    iwmob, if you think they were to cheap to put R-12 in, then test it. They probably put propane or Freeze-zone imitation stuff in there. It's cheap, but you can;t recycle it unless you have a junk tank to do it in. I bought a freon test machine from snap-on. I test every car before I work on...
  12. SammyDaFish

    Benefits of ceramic coating chamber parts

    Has anyone read any of the following SAE papers? Do any of them give the type of information I'm looking for? 900402 Ceramic Piston-Cup--Design and Testing 892495 Reinforced Composites for Piston Engine Components 891984 Exhaust Heat Containment System 91A105 Ceramic Coating for...
  13. SammyDaFish

    Benefits of ceramic coating chamber parts

    Pat, thanks for your response. And thatnks for the links guys. I read through all the info on the sites, but unfortunatly, it's more semitech sales pitch than actualy test data. Nowhere yet have I seen actual quantitive numbers. It all sounds good though. Basicaly I'm still where I started...
  14. SammyDaFish

    Benefits of ceramic coating chamber parts

    Does anyone have some information on actual test results and hard data in regards to ceramic coating combustion chamber parts? I understand that the coating increases thermal efficiency, but by how much? I plan to have my piston crowns and the chamber area of the head coated. My understanding...
  15. SammyDaFish

    Exhaust scavenging on a turbo header

    Efficiency is how I want to win. Sure, I could just put a bigger turbo on it and crank up the boost to win dyno competitions, but I want a street car that makes 600 wheel horepower and gets 25 miles to the gallon (as long as your right foot stays light ;) ) Light weight, presision tunning and...
  16. SammyDaFish

    Exhaust scavenging on a turbo header

    Warpspeed, great post :) ...... that makes a lot of sense, and I've heard mixed responses on the streets about weather or not there is a negative pressure wave on a turbo car. I'm running an inline 6, single turbo. It's a street, mild drag car, estimated output is about 700hp. What I'm...
  17. SammyDaFish

    Exhaust scavenging on a turbo header

    hmm.... why did this thread die? I'm interested to know more. Is there a true bennifit to an equil length header in a turbo application? What about twin entry turbos? Some manufacturers have used them to help spoolup on small displacement engines (Toyota 3SG an CT-26 for example). Is there...

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