Author Topic: CC's above piston and compression ratio / pre cup cc volume  (Read 6279 times)

February 10, 2008, 03:27:59 pm

subsonic

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CC's above piston and compression ratio / pre cup cc volume
« on: February 10, 2008, 03:27:59 pm »
Found this in a old post by racer-x:


Here's a "chart" of volume above the piston vs. compression ratio.  Also included is a quote from Dave with pre cup volumes:

Quote from: 935racer
I am working on compiling as much info as possible on the vw idi pre cup inserts. Today I bought a brand new 1.9 pre cup, and I pulled a 1.6td precup and a 1.6 na pre cup and measured the volume.

1.9td-5.8cc
1.6td-5.2cc
1.6na-5.5cc


cc above piston | compression ratio
18 | 23:1
*********************************************************************
18.5 | 22.4054054054054:1
*******************************************************************
19 | 21.8421052631579:1
*****************************************************************
19.5 | 21.3076923076923:1
***************************************************************
20 | 20.8:1
**************************************************************
20.5 | 20.3170731707317:1
************************************************************
21 | 19.8571428571429:1
***********************************************************
21.5 | 19.4186046511628:1
**********************************************************
22 | 19:1
*********************************************************
22.5 | 18.6:1
*******************************************************
23 | 18.2173913043478:1
******************************************************
23.5 | 17.8510638297872:1
*****************************************************
24 | 17.5:1
****************************************************
24.5 | 17.1632653061224:1
***************************************************
25 | 16.84:1
**************************************************
25.5 | 16.5294117647059:1
*************************************************
26 | 16.2307692307692:1
************************************************
26.5 | 15.9433962264151:1
***********************************************
27 | 15.6666666666667:1
***********************************************
27.5 | 15.4:1
**********************************************
28 | 15.1428571428571:1
*********************************************
28.5 | 14.8947368421053:1
********************************************
29 | 14.6551724137931:1
*******************************************
29.5 | 14.4237288135593:1
*******************************************
30 | 14.2:1
******************************************


2009 Jetta TDI Loyal edition, 6-spd. 16V 2.0CR


1985 VW Golf 5-spd, 4-door, 1.6NA  Bought from orig. owner in Savannah with 42,000 miles.
"Making the jump NA to TD" slow but sure.

1980 VW Rabbit LS 5-spd, 4-door 1.6NA almost 450,000miles  RIP

Reply #1February 11, 2008, 08:13:50 am

saurkraut

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Re: CC's above piston and compression ratio / pre cup cc vol
« Reply #1 on: February 11, 2008, 08:13:50 am »
Quote from: subsonic

1.9td-5.8cc
1.6td-5.2cc
1.6na-5.5cc

quote]

Are those the volumes of just the swirl chamber covers, or the whole swirl chamber, including injectors, heat shields, and glow plugs?
'79 1.6TD RABBIT
'84 1.5TD RABBIT
'83 Diesel Westy
'86 Audi 5000 Turbo Quatro Wagon
92 Audi 100
'93 Eurovan
'82 Porsche 930

Reply #2February 11, 2008, 09:25:47 am

MJF

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Re: CC's above piston and compression ratio / pre cup cc vol
« Reply #2 on: February 11, 2008, 09:25:47 am »
Quote from: saurkraut
Quote from: "subsonic"

1.9td-5.8cc
1.6td-5.2cc
1.6na-5.5cc

quote]

Are those the volumes of just the swirl chamber covers, or the whole swirl chamber, including injectors, heat shields, and glow plugs?


Just covers, Ive measured 10-12cc from different heads.
'74 VW Scirocco TD
'86 Audi 80q 1,9TDic
'01 Audi A6q 2,5TDI

Reply #3February 11, 2008, 10:14:23 am

jimfoo

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CC's above piston and compression ratio / pre cup cc volume
« Reply #3 on: February 11, 2008, 10:14:23 am »
And I assume the CR is for a 1.6 as a 1.9 would have a different CR for the same volume.
Jim
1966 Land-Rover 88" with 1.9 AAZ which has been transformed to an M-TDI
GT1749V, IC , and 2.5" exhaust.
Driven daily

Reply #4February 11, 2008, 10:51:53 am

saurkraut

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CC's above piston and compression ratio / pre cup cc volume
« Reply #4 on: February 11, 2008, 10:51:53 am »
Thats interesting. I've computed the following from engine data tables:

1.5 Swirl chamber volume 11.457 cc

1.6 Swirl chamber volume 12.794 cc

1.9 Swirl chamber volume 16.376 cc
'79 1.6TD RABBIT
'84 1.5TD RABBIT
'83 Diesel Westy
'86 Audi 5000 Turbo Quatro Wagon
92 Audi 100
'93 Eurovan
'82 Porsche 930

Reply #5February 11, 2008, 01:25:49 pm

MJF

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CC's above piston and compression ratio / pre cup cc volume
« Reply #5 on: February 11, 2008, 01:25:49 pm »
Quote from: "saurkraut"
Thats interesting. I've computed the following from engine data tables:

1.5 Swirl chamber volume 11.457 cc

1.6 Swirl chamber volume 12.794 cc

1.9 Swirl chamber volume 16.376 cc


These include chamber in piston top and piston to head clearance too.
'74 VW Scirocco TD
'86 Audi 80q 1,9TDic
'01 Audi A6q 2,5TDI