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How To Measure for Compression Ratio Calculations / Vitara Evaluation

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How To Measure for Compression Ratio Calculations / Vitara Evaluation

Old 02-05-2006, 08:39 PM
  #11  
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Default Re: How To Measure for Compression Ratio Calculations / Vitara Evaluation

We used the numbers for a two layer Y8 gasket, which is .025''. After looking at the Y8 gasket, there is not one of the layers that looks like a good candidate for removal. The two outer layers have the embossing and sealing coating, while the single inner layer has specific coolant passages that look rather important for proper head cooling.

The stock Y8 gasket is .037'', the comparable Cometic is .030. This ends up being about .1CR difference. Not enough to really matter in this application. We could move to a .016" copper gasket, but really don't want to perform teh needed O-ring procedure need to properly use a copper plate gasket.

So it looks like the factory Y* gasket is what we are going to run with for now.

We used the A6 block because that is what we had. Our goal was to do a budget build using the cheapest components we could find, or have on hand.

Craig
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Old 02-27-2006, 01:15 PM
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Default Re: How To Measure for Compression Ratio Calculations / Vitara Evaluation

id run the 7.6:1 ratio. im at 7.9:1 and my ---- goes nice. so what ifi ts a bit laggy out of boost. its a d series who cares
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Old 03-17-2006, 05:52 PM
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Default Re: How To Measure for Compression Ratio Calculations / Vitara Evaluation

i guess this doesnt take into account loses due to valve overlap and when valves open/close (so this is known as mechanical compression or static compression right?)

either way, good stuff.. and where's the next write up!
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Old 04-15-2006, 06:21 PM
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Default Re: How To Measure for Compression Ratio Calculations / Vitara Evaluation

Any updates on this?
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Old 04-19-2006, 02:16 AM
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Default Re: How To Measure for Compression Ratio Calculations / Vitara Evaluation

for some reason all the calculators i tried said 9.1:1 for the a6 stock, not 9.7:1
so does that mean all the calculators are off??
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Old 05-18-2006, 06:22 PM
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Default Re: How To Measure for Compression Ratio Calculations / Vitara Evaluation

he just got it running a few weeks back and is boosting it now. Says it runs good
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Old 01-25-2007, 09:00 PM
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Default Re: How To Measure for Compression Ratio Calculations / Vitara Evaluation

Originally Posted by TunerToys
We used the TT H-Beams (of course) and had them honed to fit the floating pins on the Vitaras. Our machine shop charged us $40 for this.

For the piston to wall fitment, I was initially that the Vitaras were going to be a bit sloppy in the holes, but they appear to be okay. Since this is my first real hybrid of this type, I wanted a professional to verify my work. We used the same machine shop for milling the head mating surfaces of the block, and I had them hone the cylinders while they had the block. Ray (Basko Machine) stated that the bores were not round, and did a rigid hone, to correct it. He also had me bring down the Vitara pistions, to ensure the fitment, and said there would be no problem.

If the standard size Vitaras had not been usable, I had imagined that I could just get some oversize Vitaras. But once you start down the oversize/boring/machining path ($$$), you might as well buy some forged pistons. On that path, you'll already have a lot of money in machining the block, so why put in bargain basement pistons...

Craig
With the TT rods for the b18a1, and the wesico pistons i used, i also had to have them honed out a bit for the floating wristpin. For the wesico pistons, the machine shop also had to mill the sides a bit to get the proper side to side clearance bewteen the top of the connecting rod, and piston (where the wrist pin goes through.)
Other than that, they're minty fresh. i only got charged 40$ for all of this work.. and also having them all hung w/ the spiro locks.
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Old 01-28-2007, 07:45 AM
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Default Re: How To Measure for Compression Ratio Calculations / Vitara Evaluation

awesome write up!

i noob question abuot name of that "black box" that support dial indicator..how it's called in english it?



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Old 03-10-2007, 04:47 AM
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Default Re: How To Measure for Compression Ratio Calculations / Vitara Evaluation

Originally Posted by Walter
awesome write up!

i noob question abuot name of that "black box" that support dial indicator..how it's called in english it?



What block guard did you use. Make sure that people know MOST block guards only ADD to the stress
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Old 03-14-2007, 10:19 AM
  #20  
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Default Re: How To Measure for Compression Ratio Calculations / Vitara Evaluation

Nice article & well written.
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