thought you might get a kick out of this
- chachi
- Old School!
- Location: ne pdx, or.
- Contact:
- Status: Offline
Re: thought you might get a kick out of this
...
1974 transporter panel, 2.0 dual solex
1991 vanagon NAHT, RJE 2.3
1991 vanagon NAHT, RJE 2.3
- Westy78
- IAC Addict!
- Location: Stumptown OR
- Status: Offline
Re: thought you might get a kick out of this
Of course. I was thinking backwards. I should've got that faster since I built my own engine.chachi wrote:Westy78 wrote:Am I missing something? How are you doing a compression test with no rockers and push rods?
rockers and push rods actuate the valves, but you don't need them to open and close. the crank will actuate the piston so you'll get that compression even without them.
Chorizo, it's what's for breakfast.
- RSorak 71Westy
- IAC Addict!
- Location: Memphis, TN
- Contact:
- Status: Offline
Re: thought you might get a kick out of this
To get an accurate compression test result you DO need them to open and close.!!!!but you don't need them to open and close.
Take care,
Rick
Stock 1600 w/dual Solex 34's and header. mildly ported heads and EMPI elephant's feet. SVDA W/pertronix. 73 Thing has been sold. BTW I am a pro wrench have been fixing cars for living for over 30 yrs.
Rick
Stock 1600 w/dual Solex 34's and header. mildly ported heads and EMPI elephant's feet. SVDA W/pertronix. 73 Thing has been sold. BTW I am a pro wrench have been fixing cars for living for over 30 yrs.
- chachi
- Old School!
- Location: ne pdx, or.
- Contact:
- Status: Offline
Re: thought you might get a kick out of this
...
1974 transporter panel, 2.0 dual solex
1991 vanagon NAHT, RJE 2.3
1991 vanagon NAHT, RJE 2.3
- chachi
- Old School!
- Location: ne pdx, or.
- Contact:
- Status: Offline
Re: thought you might get a kick out of this
...
1974 transporter panel, 2.0 dual solex
1991 vanagon NAHT, RJE 2.3
1991 vanagon NAHT, RJE 2.3
- Amskeptic
- IAC "Help Desk"
- Status: Offline
Re: thought you might get a kick out of this
You cannot get compression results with no valves. The cylinders need that intake fill and they need that exhaust emptying to get any movement of air.
Otherwise you just discover if the rings like to blow-by more on the down or the up.
Otherwise you just discover if the rings like to blow-by more on the down or the up.
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
- Amskeptic
- IAC "Help Desk"
- Status: Offline
Re: thought you might get a kick out of this
Good eye, Westy78! There is no compression test without proper valve actuation.Westy78 wrote:Of course. I was thinking backwards. I should've got that faster since I built my own engine.chachi wrote:Westy78 wrote:Am I missing something? How are you doing a compression test with no rockers and push rods?
rockers and push rods actuate the valves, but you don't need them to open and close. the crank will actuate the piston so you'll get that compression even without them.
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
- chachi
- Old School!
- Location: ne pdx, or.
- Contact:
- Status: Offline
Re: thought you might get a kick out of this
...
1974 transporter panel, 2.0 dual solex
1991 vanagon NAHT, RJE 2.3
1991 vanagon NAHT, RJE 2.3
- Gypsie
- rusty aircooled mekanich
- Location: Treadin' Lightly under the Clear Blue!
- Status: Offline
Re: thought you might get a kick out of this
If you are not filling the chamber with air you cannot see how much it will hold in when it compresses or at least not an accurate assessment of compression.
When the piston is moving away from the head a vacuum is forming if the valves are not opening. then when it goes to compress it will pass the vacuum point and start compressing but by that time you won't have enough travel to create an accurate reading.
When the piston is moving away from the head a vacuum is forming if the valves are not opening. then when it goes to compress it will pass the vacuum point and start compressing but by that time you won't have enough travel to create an accurate reading.
So it all started when I wanted to get better gas mileage....
- Bleyseng
- IAC Addict!
- Location: Seattle again
- Contact:
- Status: Offline
Re: thought you might get a kick out of this
if you have not installed the rockers etc then just do a leakdown test but without the rings being seated its kinda worthless. Just like a compression test without the valves opening and closing plus the engine should be warm.
Geoff
77 Sage Green Westy- CS 2.0L-160,000 miles
70 Ghia vert, black, stock 1600SP,- 139,000 miles,
76 914 2.1L-Nepal Orange- 160,000+ miles
http://bleysengaway.blogspot.com/
77 Sage Green Westy- CS 2.0L-160,000 miles
70 Ghia vert, black, stock 1600SP,- 139,000 miles,
76 914 2.1L-Nepal Orange- 160,000+ miles
http://bleysengaway.blogspot.com/