I moved from a 509" BBC to a 555" one. Same engine just opened up the bore and changed the stroke. I left everything else the same save for adding a vacuum pump. Same heads, camshaft, intake, carb and ignition.
I run a 8" convertor with a flash of 6100-6200 & its spragless. How big an effect would the additional cubes have on the convertor? Combination at the moment just seems "off" from what it was before the size change.
October 25, 2021, 10:33 AM
Mike Rietow
quote:
Originally posted by chasracer: I moved from a 509" BBC to a 555" one. Same engine just opened up the bore and changed the stroke. I left everything else the same save for adding a vacuum pump. Same heads, camshaft, intake, carb and ignition.
I run a 8" convertor with a flash of 6100-6200 & its spragless. How big an effect would the additional cubes have on the convertor? Combination at the moment just seems "off" from what it was before the size change.
Depends on the increase or decrease in power.
100hp is 400 rpm's of observed stall, as example.
October 25, 2021, 12:02 PM
The Bozman
you are probably blowing through the convertor with the added TQ, heads and cam information as well as car information would also be of value.
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October 25, 2021, 01:49 PM
chasracer
The heads are BB-2X with some pro level porting.
Cam Spec:
@.050 282/294 .427/.420
Gross lift .720/.714 Lobe Sep: 110 Installed at 108 ICLThis message has been edited. Last edited by: chasracer,
October 25, 2021, 04:12 PM
Goob
You've run out of cam and cylinder head for those inches, been here, seen this. NOT to say that a converter change wouldn't help you achieve something.
You need 355cc+ intake runners and .800"-.820" lift to do the 555 justice.
"Despite the high cost of living, it remains popular." Dave Cook N375
October 25, 2021, 05:35 PM
RPROGAS
I agree with Bozman, you'll probably blow through that 8 inch given the flash numbers you posted using the 509. I would try that original 8 inch and see how it acts. That cam looks a little short on the lift side for a 555.
It may be time to look at a spragless 9inch.
Bob
October 25, 2021, 05:42 PM
SCDIV1
The 555 will not work well with the same parts.
Heads to small, cam way to small.
More low end torque but it’ll run out of steam as rpm rises.
Just last year I upped my engine from a 565 to a 584
Same heads and cam
The 584 is weaker than the engine as a 565.
Has more torque down low but that’s it...
Same converter is a little bit looser.
I ran a 509 with an 8” converter and went to a 9” when I built the 565
I can recall feeling like I never should have sold the 8” and just tried it behind that 565
I think it would have been just fine
October 26, 2021, 09:47 AM
Bob Deniker
I would try it. That's JMO, and I'm sure the resident expert will tell me I'm wrong.
RPM and Torque are measurable quantities of engine output
If you think you can go faster and more consistent with a diesel operating at lower rpm, have at it, but it's the opposite of what the tire / chassis wants in the burnout, or on the starting line.
October 26, 2021, 01:55 PM
chasracer
Not sure what "try it" means in this context.
But here are the facts, even though I know that the parts are not optimal, I'm not changing cylinder heads, intake, ignition, etc. The 509 ran 4.93-4.94 pretty consistently. If I hadn't messed up the crankshaft, I would still be running it. The 509 launched well and pulled like a beast - I was happy with it so at this point I have basically screwed myself. To be honest, I'm disappointed in the 555 at this point. I'm not in a position to throw a lot at it which is where dial boards and shoe polish come in. I would consider upgrading the roller cam and then going after another convertor. I do have a larger carb that I can put on this deal.
Anyone moved up from a 540-555 and have a good condition roller cam they want to part with?
October 26, 2021, 02:39 PM
JakeW143
I ran an 8" behind my 485, 532 and my current set up which is a 555. I ran the same convertor behind both the 532 and 555 with the same exact internals besides crankshaft and gained about 200 in stall.
October 26, 2021, 02:47 PM
chasracer
quote:
Originally posted by JakeW143: I ran an 8" behind my 485, 532 and my current set up which is a 555. I ran the same convertor behind both the 532 and 555 with the same exact internals besides crankshaft and gained about 200 in stall.
sent PM
October 26, 2021, 10:32 PM
Goob
quote:
Originally posted by chasracer: Not sure what "try it" means in this context.
But here are the facts, even though I know that the parts are not optimal, I'm not changing cylinder heads, intake, ignition, etc. The 509 ran 4.93-4.94 pretty consistently. If I hadn't messed up the crankshaft, I would still be running it. The 509 launched well and pulled like a beast - I was happy with it so at this point I have basically screwed myself. To be honest, I'm disappointed in the 555 at this point. I'm not in a position to throw a lot at it which is where dial boards and shoe polish come in. I would consider upgrading the roller cam and then going after another convertor. I do have a larger carb that I can put on this deal.
Anyone moved up from a 540-555 and have a good condition roller cam they want to part with?
If you can find one used, it's hard to beat the Reher-Morrison 555 Bracket cam, it's a little over .800" lift and easy on parts, or Bullet can do a very similar grind.
"Despite the high cost of living, it remains popular." Dave Cook N375
October 27, 2021, 05:52 AM
SCDIV1
Goob's suggestion is a good one.
R-M 420-116 is an Erson cam, makes good power, does not require huge spring pressure and does not break parts
I've used that cam and have one on the shelf
October 27, 2021, 07:54 AM
chasracer
Thanks for the cam suggestions. I appreciate your help!
October 27, 2021, 09:01 AM
Bob Deniker
[QUOTE]Originally posted by chasracer: Not sure what "try it" means in this context.
Try it means put it in and try it. At least you'll know what you need to do, if any adjustments need made.
Originally posted by Bob Deniker: [QUOTE]Originally posted by chasracer: Not sure what "try it" means in this context.
Try it means put it in and try it. At least you'll know what you need to do, if any adjustments need made.
I think we're having a comm problem here.
I do not know what you are suggesting I put in the engine and try.
October 27, 2021, 09:38 PM
Duane1791
Your cam is not that bad, I basically used the same pieces in the early 2000's and they always made between 850-900 horsepower. You need to look at others things.
Duane Allen
October 27, 2021, 09:57 PM
Mike Rietow
quote:
Originally posted by Duane1791: Your cam is not that bad, I basically used the same pieces in the early 2000's and they always made between 850-900 horsepower. You need to look at others things.