Discussion
Thought I would resurrect this thread.
Now with a new 'remanufactured' 96mm top hat block from ACR. The offset crank is in, Chevy I beam rods and forged pistons in and clearances checked.
So I am back to fitting the crower solid cam with brand new timing chain and vernier.
I set the cam straight up at the recommended 104 degree but initial check on valve clearance has very little on the Inlets and more than plenty on the exhausts. So I guess I need to set it a few degrees retarded to stay safe.
Now with a new 'remanufactured' 96mm top hat block from ACR. The offset crank is in, Chevy I beam rods and forged pistons in and clearances checked.
So I am back to fitting the crower solid cam with brand new timing chain and vernier.
I set the cam straight up at the recommended 104 degree but initial check on valve clearance has very little on the Inlets and more than plenty on the exhausts. So I guess I need to set it a few degrees retarded to stay safe.
I have timed the cam in at 107 degrees so it now sits 3 degrees retarded from the recommendation on the cam card.
The blue was at 104 and the red is at 107. As you can see more than twice the clearance.
Last time using the multi keyway timing set the best I could get was 102, ie 2 degrees advanced. So this cam is now set 5 degrees retarded from where it was at when I had the engine running on Dales dyno. At the time we were impressed with the torque but disappointed when peak power went flat. Hopefully the new cam setting combined with new timing gear and new valve springs that have been set properly we can recover that power at the top end I was hoping to see.
Heres the graph from the last time... the dotted lines are where I was hoping to be
The blue was at 104 and the red is at 107. As you can see more than twice the clearance.
Last time using the multi keyway timing set the best I could get was 102, ie 2 degrees advanced. So this cam is now set 5 degrees retarded from where it was at when I had the engine running on Dales dyno. At the time we were impressed with the torque but disappointed when peak power went flat. Hopefully the new cam setting combined with new timing gear and new valve springs that have been set properly we can recover that power at the top end I was hoping to see.
Heres the graph from the last time... the dotted lines are where I was hoping to be
Edited by DangerousDerek on Sunday 28th February 13:41
phazed said:
Changing the valve timing is very interesting Derek.
That is something I would quite like to do on mine as I'm sure I could increase the BHP for a small reduction in torque but I really can't be arsed at the moment due to my other boring, (by comparison) project!
To be safe you would want to check valve to piston clearance when retiming the cam too so not a simple job. That is something I would quite like to do on mine as I'm sure I could increase the BHP for a small reduction in torque but I really can't be arsed at the moment due to my other boring, (by comparison) project!
I think it could be worth the effort on your though Peter. Have a weekend off the other boring project and try make yours good enough to hold the NA title
carsy said:
I have had the same problem with those same gaskets previously. They aint big enough despite being sold as big bore.
The ones that Power sell are the perfect size and didnt need any fettling.
Worth checking manifold to head alignment as well Derek. My manifolds needed opening up quite a bit.
I had opened the manifolds previously but they showed tell tale signs of misalignment so I have opened them more. They are about a mm bigger al round than the gaskets and heads now so a little room for movement. The ones that Power sell are the perfect size and didnt need any fettling.
Worth checking manifold to head alignment as well Derek. My manifolds needed opening up quite a bit.
Edited by carsy on Saturday 12th March 15:26
The flywheel, clutch and bellhousing are fitted and the engine is hanging on the chainblock waiting to be lowered in tomorrow.
It fired up first time.
I ran it at a minimum of 2k revs until the temp started coming up. The AFR started to weaken off so I shut it off. I had reduced the required fuel to weaken it for the initial start up. Ive reset it nearer the original setting. Will check the oil and water levels before I fire it again.
I ran it at a minimum of 2k revs until the temp started coming up. The AFR started to weaken off so I shut it off. I had reduced the required fuel to weaken it for the initial start up. Ive reset it nearer the original setting. Will check the oil and water levels before I fire it again.
Gassing Station | Chimaera | Top of Page | What's New | My Stuff