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Underbody braces, turbos and more!

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PostPosted: Thu Jun 29, 2006 8:40 am 
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Yes, one thing is Compression, and another thing is Compression Ratio.

Anyway, did you get those values on the smaller dish pistons or the deeper ones ?

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PostPosted: Thu Jun 29, 2006 8:42 am 
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Caaarlo wrote:
Yes, one thing is Compression, and another thing is Compression Ratio.

Anyway, did you get those values on the smaller dish pistons or the deeper ones ?


ian is that 170psi from the pistons caarlo posted above?

I think i'll try and get the compression test from my car today and post it ...

...

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PostPosted: Thu Jun 29, 2006 9:54 am 
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i have seen this done on a honda before

jus the same.......... one of my friends bought pistons for his honda that were to raise his compression to 12.5:1 from 11:1 and we did the same static compression test and the maths i did worked out right.........

to me (my opinion) if you have a higher compression ratio, u must have a linear increase in static compression because they are both related to the same cylinder. makes sense to me and numbers dont lie.

is as if you finding the area and volume of a cup of water..... more surface area = more volume, in one way or another


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PostPosted: Thu Jun 29, 2006 10:38 am 
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Ok sounds good but was the 170 from a swift with the low compression pistons?

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PostPosted: Thu Jun 29, 2006 11:16 am 
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Absolutely right. Number don't lie... only if you take everything into account. As far as I know, compression is not linearly related to compression ratio.

Either way, what kind of pistons do you have ?? because I have calculated one piston to have around 7.4 and the other one to have around 7.9. Which is pretty close to my calculations. Did you shave your head or something ? Maybe this explains why you're having such a good compression while most people is getting ~150 psi from the deep dish vitara pistons.

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PostPosted: Fri Jun 30, 2006 6:39 am 
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I was getting 165 - 170psi compression with the deeper dish pistons, but the block looked like it had been skimmed quite a bit in its life compared to another block I have.
Phil


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PostPosted: Mon Jul 03, 2006 4:54 pm 
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7.4:1 is absolutely perfect for a turbo engine, run 30psi boost and shut the hell up :razz:


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PostPosted: Wed Jan 28, 2009 8:19 pm 
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These are some interesting calculations, I just bought myself a set of 75,5mm Deep Dish Vitaras. The motor is going to be machined soon and ill measure when its assembled in the negine the actually findings.


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PostPosted: Fri Apr 10, 2009 1:05 pm 
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Ricardo, can you post your findings ? Did you measure the actual compression ratio ?

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PostPosted: Sat Apr 11, 2009 11:13 pm 
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please! :wink:

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PostPosted: Mon Apr 13, 2009 2:50 am 
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i just done a compression test the other day on a different motor[2.0] which was just rebuild and this is with supposedly 8.3-1 compression ratio and we got 125psi however it hadent even ben started yet so runing in will make a difference and that was cold and dry

steve

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PostPosted: Tue Apr 14, 2009 6:29 pm 
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stevegti2 wrote:
i just done a compression test the other day on a different motor[2.0] which was just rebuild and this is with supposedly 8.3-1 compression ratio and we got 125psi however it hadent even ben started yet so runing in will make a difference and that was cold and dry

steve


Well, but this has nothing to do with a 1.3 + Vitara pistons. Furthermore, cylinder compression depends on the cam profile and health of the engine internals. Therefore Compression Ratio is a more descriptive parameter than cylinder compression.

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PostPosted: Wed Apr 15, 2009 1:28 pm 
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i know that was just a rough guidline for you to compare with

steve

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PostPosted: Sun May 03, 2009 4:36 pm 
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Caaarlo wrote:
Ricardo, can you post your findings ? Did you measure the actual compression ratio ?


Sorry for the delay in reply guys. Sorry I got caught up in work, it's been hell.

I didn't assemble the engine yet, the heads still needs to be rebuilt, the bottom end came back from the machine shop but I am missing a few parts (oil pump, oil pickup tube, etc).

The crank was nitrated and unfortunately there was damage in this block I had to use larger pistons, 75,5mm. I already got the pistons here and everything. These are also YCP but look better than the other ones for some reason.

I have been with some $$ issues but I think this month I should have some spare to continue. I will contact a friend in U.S. to go in dealership and order what I need.

I also bought molykote to spray on the parts before buildup.

Will post the results once I have it.

Thanks all!


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PostPosted: Sun May 03, 2009 7:41 pm 
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Location: Winnipeg
I think the following info could be helpfull to some. All cc'ing was done properly with burrette's and 1/2 thick glass plate. Piston dish was determined with the piston sealed with a silicone o-ring in the top groove, and moved .100" down the bore, then calculated to remove the volume of the .100" displacement...so, the piston dish volume assumes a piston that is deck high. (level with the top of the block)

G16 75mm piston as used in 1998 Esteem (should be same as Vitara) 12.3 cc
G13bb 74mm piston as used in 1999 Swift 6.7 cc
GTI head (stock with no machining) 32.4 cc's
G13bb head (stock with no machining) 26.2 cc's
Felpro head gasket with 76mm bore before compression Approx 6.0 cc's
The G13bb engine was factory assemboled with the pistons almost exacty deck high.
Installing the G16 piston in a G13b block with GTI crank and rods required the block to be machined .041" to be deck high.
I machined mine .045" to get compression ratio around 8.6:1 using the G16 75mm piston
G13bb head, and felpro gasket.

I machined the top of my block for a .030" stainless steel wire. I cut the grooves .024"
for a .006 wire protrusion. I fit my ends of my wire at an angle to provide a nice leak-proof gap that is almost undetectable. (yes, i've done many of these before)
Sorry, i needed my car back together so soon, i never took any pictures.

Darcy


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PostPosted: Wed Jul 01, 2009 10:47 pm 
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Location: Barbados
Hi Guys

Check this link it has a compression ratio calculator.

http://www.rbracing-rsr.com/compstaticcalc.html


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PostPosted: Fri Jul 24, 2009 5:51 pm 
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Mr.Pipe, did you ever CCed a Mk2 turbo3 piston?

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PostPosted: Fri Jul 24, 2009 6:46 pm 
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Sorry, i've never had one here to cc.
My only T3's have been Mark 1 cars.

Darcy


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