![]() From 1950 thru 1960, it won the pole 10 times out of those 11 years. More than one Indy race was run with this being the ONLY engine in the field. It won Indy 27 times, and took all three positions on the podium for an entire decade. The original design goes all the way back to the 30s 009.Įvery 4 valve over head cam japanese import owes it heritage to this motor. The biggest reason it makes the power it does is an incredably effiecent combustion chamber, drop dead perfect ports, with perfect inclined valve angles, 4 valve twin over head cam. Peace” Jay R.Ĭopyright 2010 : Engine Basics.It was on meth. So much mis-information on forums, good to read some solid info. Thank you for showing the REAL easy way, and saving me some money.” Joe Sĭon’t have any questions, just wanted to say thanks for putting this info out there. Info from every other site I looked at, only said how to do it using costly special tools. “Thank you, for the info, on your site, on how to remove valve springs, and install stem seals, using normal shop tools. **TO SUBMIT AN ARTICLE TO ENGINE BASICS PLEASE CLICK: CONTACT US! If you enjoyed the information and article you just read be sure to check out our newly released book with even more exciting photo's and information:īelow are just a few of the articles found here on Reading Spark Plugs Be sure to like on facebook and check out some of our other articles found here on the site by selecting a subject category found at the top menu or side menu bar. Hopefully this article gives you a general idea of what the Area Ratio of a turbo is and how it affects power and response. So if you are SET on making the max power that a turbo has been rated at, you should use the largest A/R housing they offer to obtain that. When they are rating their turbo’s horsepower rating, you can be sure they are most likely using the largest turbine A/R to get those results. The manufacturers know what A/R sizes work the best and offer sizes that work with that turbo. You will most likely not be upset with the outcome. Choosing the one in the middle will give the turbo a little of both worlds. What I mean by this is most manufacturers offer several housings for each turbo. When in doubt, pick the one in the middle. These calculators will give you an exact idea of when you might see boost and show you how the different A/R sizes will effect responsiveness and the power curve.ģ. Use one of the flow calculators for your engine found at Garrett or Borg Warner’s websites. Also you can email them and ask them how responsive the set-up is and when they are starting to see boost, and when they see full boost.Ģ. Someone out there has probably installed your same turbo and you can find a review written by him or her about how it behaves on your particular engine. The beauty of the Internet is that you realize that most everything has already been done before. I offer these steps to picking the right turbine A/R for you:ġ. To small and you lose your power potential, which is the whole reason your paying the big bucks to upgrade your turbo in the first place. Go to small and the turbo will be choked up in the upper RPM powerband. If you go to large for your size motor the turbo will be lazy and slow reacting. Go to small and you bottleneck the exhaust and loose power. You go too big and you actually loose flow because you loose the scavenging effect. Think of A/R sizing like sizing an exhaust for your N/A motor. NOW BEFORE you go buying the largest A/R turbine housing you can let me explain it more. Its VERY easy to see the difference in sizes. 78 A/R housing while the larger one is a 1.04 A/R housing. They are both T3 inlet, divided housings. In the photo’s below we find two turbine housings from a Garrett GT30R turbo. Here is a great example of what this looks like. I’ll sum it up as simple as I can: The larger the number the more flow, the smaller the number the less flow. I will assume that many of you don’t want to get into the math, but want to know what this really means to you. The inlet (or, for compressor housings, the discharge) cross-sectional area divided by the radius from the turbo centerline to the centroid of that area. While compressor wheel and turbine wheel sizes are often most of the numbers to focus on, the Area Ratio, or A/R for short, of the turbine housing and compressor housing are equally important.Ī/R (Area/Radius) describes a geometric characteristic of all compressor and turbine housings. When looking for the right turbocharger for your car or truck many of us are stumped by what all the numbers mean when shopping for a turbo. What is Turbine A/R and how does it affect turbo performance?
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