Morgans 68 Charger. Engine #3...
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Re: Morgans 68 Charger. Engine #3...
Morning all...
Been a bit of a delay; not had a chance to sort the vacuum out yet but will update when I do.
This mornings fun was 'compression check' - basically following some long and VERY useful conversations over 'what else to do while engine is out for rear seal' (you know who you are; thankyou ! ) it was suggested a compression check would be a good place to start.
After all, engine has had 'a life' and had a lot of 'sniff' so a compression check would give me an idea if rings were hanging in there...
Interesting results actually - learned quite a lot this morning.
1) Learned that there are loads of variables for converting compression ration to PSI readings - so really its a 'ballpark thing'. Obvs the higher the compression ratio the higher the PSI. Its more about an even spread.
2) My observations suggest that as I worked through my readings fell by about 20psi - I have concluded that as the smell of fuel increased (and the rings got wet) the pressure dropped slightly. In fact I retested the first one at the end and the drop was just that - 20psi between reading #1 and #2.
I remember from my rotary days, once you flood a rotary engine you just cant get it to start - they have no compression if 'wet'. Assume this is the same phenomenon.
So - results dont look too bad. Its all squashing. (Although not 'within 10%' - but there is fudge-factor ambiguity here. Will run control tomorrow.)
Conclusions -
- All cylinders hold pressure.
- Highest was 175psi (195 dry)
- Lowest was 155psi
Compression ratio ~10.5ish:1
Been a bit of a delay; not had a chance to sort the vacuum out yet but will update when I do.
This mornings fun was 'compression check' - basically following some long and VERY useful conversations over 'what else to do while engine is out for rear seal' (you know who you are; thankyou ! ) it was suggested a compression check would be a good place to start.
After all, engine has had 'a life' and had a lot of 'sniff' so a compression check would give me an idea if rings were hanging in there...
Interesting results actually - learned quite a lot this morning.
1) Learned that there are loads of variables for converting compression ration to PSI readings - so really its a 'ballpark thing'. Obvs the higher the compression ratio the higher the PSI. Its more about an even spread.
2) My observations suggest that as I worked through my readings fell by about 20psi - I have concluded that as the smell of fuel increased (and the rings got wet) the pressure dropped slightly. In fact I retested the first one at the end and the drop was just that - 20psi between reading #1 and #2.
I remember from my rotary days, once you flood a rotary engine you just cant get it to start - they have no compression if 'wet'. Assume this is the same phenomenon.
So - results dont look too bad. Its all squashing. (Although not 'within 10%' - but there is fudge-factor ambiguity here. Will run control tomorrow.)
Conclusions -
- All cylinders hold pressure.
- Highest was 175psi (195 dry)
- Lowest was 155psi
Compression ratio ~10.5ish:1
- Attachments
-
- squashandasqueeze.jpg (19.36 KiB) Viewed 1826 times
"Cum homine de cane debeo congredi." Woof.
Current Charger status - "Working !"
Current Charger status - "Working !"
Re: Morgans 68 Charger. Engine #3...
Oh, and one for you plug doctors.
500miles ish. 350 motorway, 100 tooling about, 50 being nailed
Look a little dark to me; rich. #8 and #6 a little cruddy.
500miles ish. 350 motorway, 100 tooling about, 50 being nailed
Look a little dark to me; rich. #8 and #6 a little cruddy.
- Attachments
-
- plug_doc.jpg (57.96 KiB) Viewed 1824 times
"Cum homine de cane debeo congredi." Woof.
Current Charger status - "Working !"
Current Charger status - "Working !"
Re: Morgans 68 Charger. Engine #3...
EDIT - Well tested #7 and 5 again after 8hrs rest. (dryish). 185 and 175 respectively. (up 30/15psi respectively). I think the conclusion is that first tested gets the best reading. The lowest last time matched the highest this time. So it seems that 'dry' they will all do 175/185. I am happy.
"Cum homine de cane debeo congredi." Woof.
Current Charger status - "Working !"
Current Charger status - "Working !"
Re: Morgans 68 Charger. Engine #3...
Interesting thread Morgan re upgrades....looking forward to seeing this motor go down the strip now you've got a proper engine in her !!!
At my Worst,I'm at my Best ......
072
072
Re: Morgans 68 Charger. Engine #3...
Rich. Have you been talking to Pete ? His mission in life is to disrupt my cruising with this drag racing business...
Yeah, its in and sorted now.
Few funnies - rear seal had gone/shrunk so big oil leak made a mess - sorted now. Still fiddling as I had a problem with dizzy (turned out to be rotor or cap or both). It goes like the clappers now - BUT (and hands up if you saw this coming) only when nailing her. And wow does it rev. Down low cruising she is pretty rough - its got quite a cam/compression in it. For my usage it could probably use calming down a bit cam wise but thats not a job for me... this year is for fettling and having fun - or rather it should have been had it not been for lockdown !
Yeah, its in and sorted now.
Few funnies - rear seal had gone/shrunk so big oil leak made a mess - sorted now. Still fiddling as I had a problem with dizzy (turned out to be rotor or cap or both). It goes like the clappers now - BUT (and hands up if you saw this coming) only when nailing her. And wow does it rev. Down low cruising she is pretty rough - its got quite a cam/compression in it. For my usage it could probably use calming down a bit cam wise but thats not a job for me... this year is for fettling and having fun - or rather it should have been had it not been for lockdown !
"Cum homine de cane debeo congredi." Woof.
Current Charger status - "Working !"
Current Charger status - "Working !"
Re: Morgans 68 Charger. Engine #3...
Why put a "Drag race" motor in a "Cruiser" then??
Only kidding!!!
All the best!
(See you at the track....)
Only kidding!!!
All the best!
(See you at the track....)
Pete Wiseman; Cambridge.
Mopar by the grace of God
Mopar by the grace of God
Re: Morgans 68 Charger. Engine #3...
Hi Morgan good to catch up, yes these upgrades will always test your patience ..and wallet !!.Been there done that when I put the new stroker engine in my Charger it also had a big lumpy cam in it...bloody thing hated tick over and low speeds in fact I Think it ruined a great cruzing motor but that was my fault got carried away.....like you do...morgan wrote: ↑Wed Apr 29, 20 12:20 pm Rich. Have you been talking to Pete ? His mission in life is to disrupt my cruising with this drag racing business...
Yeah, its in and sorted now.
Few funnies - rear seal had gone/shrunk so big oil leak made a mess - sorted now. Still fiddling as I had a problem with dizzy (turned out to be rotor or cap or both). It goes like the clappers now - BUT (and hands up if you saw this coming) only when nailing her. And wow does it rev. Down low cruising she is pretty rough - its got quite a cam/compression in it. For my usage it could probably use calming down a bit cam wise but that's not a job for me... this year is for fettling and having fun - or rather it should have been had it not been for lockdown !
Look forward to seeing you maybe later in the year when all this virus crap is out of the way....who knows I might even bring my Chevy to MOPAR meet !!
Be safe..Rich.
At my Worst,I'm at my Best ......
072
072
Re: Morgans 68 Charger. Engine #3...
Because i am 12 and cant help myself...
"Cum homine de cane debeo congredi." Woof.
Current Charger status - "Working !"
Current Charger status - "Working !"
Re: Morgans 68 Charger. Engine #3...
I am 14!!
Unfortunately, I also have the body (and sadly the face) of a 60 year old!!!
Pete Wiseman; Cambridge.
Mopar by the grace of God
Mopar by the grace of God
Re: Morgans 68 Charger. Engine #3...
does he know!!!?
dave
dave
The Greater Knapweed near the Mugwort by the Buckthorn tree is dying