nanbuicker
New Member
- Joined
- Feb 9, 2011
I'm in contact with one of the respected site sponsors regarding a new 2004R and lock up converter for me. I have problems understanding his point and i wanted to ask here for explanation, because i don't think he has the time to chit chat this out via email, i am in Germany, thats why i don't call. I wouldn't understand on the phone anyways.
I totally trust this sponsor, but it seems like i just don't understand it.
Here's our shortened email traffic:
Me:
Him:
Me:
Him:
That's where i can't follow him anymore.
Here’s my understanding until now:
- on a non-lock up tranny like the TH350 I have now, cruise rpm should be above stall speed rpm, otherwise it would be slipping during cruise and creating lots of heat.
- on a lock up I thought it doesn’t matter, because the tranny will look up in 4th gear, so there is no slippage regardless of what cruise rpm is?
Could anybody explain, or maybe also give his recommendation for stall speed? Point is, cam rpm starts at 3k.
Thank you very much!
Olli
I totally trust this sponsor, but it seems like i just don't understand it.
Here's our shortened email traffic:
Me:
Could you make me an offer for this combo:
2004R /w LockUp
Lock Up Converter
Regarding stall speed see the cam specs below, I’d go for 3000 to 3200 I think.
Here are the specs of my car:
71 Chevelle Malibu, full interior/weight, 383, 10.2:1, all forged, AFR 195 heads, HR-296-2S-12 Roller cam, around 450hp
Cam specs: Crane Cams 109841 - Crane PowerMax Camshafts - Overview - SummitRacing.com
Him:
I think your selection is correct with the exception of the stall speed.I would suggest you use a 2800 stall speed
Me:
Why do you think it will need only 2800 stall? The cam specs say that rpm range starts at 3000. At the moment I have a 2400 converter and it’s choking the cam. You know I thought if it has lock up in fourth it wouldn’t matter if stall speed was a little higher. I will listen to your advice though! If you say 2800 is better, then that’s what I will order.
Him:
Oliver you dont want the engine rpm at cruise to be above the stall rpm or the engine will not make efficient use of the gasoline.
That's where i can't follow him anymore.
Here’s my understanding until now:
- on a non-lock up tranny like the TH350 I have now, cruise rpm should be above stall speed rpm, otherwise it would be slipping during cruise and creating lots of heat.
- on a lock up I thought it doesn’t matter, because the tranny will look up in 4th gear, so there is no slippage regardless of what cruise rpm is?
Could anybody explain, or maybe also give his recommendation for stall speed? Point is, cam rpm starts at 3k.
Thank you very much!
Olli