Dyno Results: 502 w/ AFRs

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05-17-2014 | 09:56 AM

#61

242LS

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From: East Greenwich, RI

Quote:

Originally Posted by I'CE

did the 548 near 665hp? thanks so much on 242's engine builds your good to go, now he must be careful on the sticks. any prop talk yet ? or just spin em.

Considering I never saw more than 4950 RPMs with my BBlades labbed M+ 23P 3 blades (1.36 GR), I want to see more RPM with the same prop. Bob's target was 5700. I'd be very happy with 5400-5500.

BTW - Just went 188 MPH on the MagLev in Shanghai.
[ATTACH=CONFIG]523509[/ATTACH]

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05-17-2014 | 11:50 AM

#62

MILD THUNDER

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From: chicago

Quote:

Originally Posted by lil red

I did on a 548 last week with the same heads and quench, same style piston. Power didn't go up, actually lost some at 36* and egt's only dropped a few degrees. Most of these guys fill up on the road with 93 octane which I prefer, more additives etc. less chance of getting a bad tank of fuel. So I don't mind running a little hotter plug, a little lower air fuel and the temps fall in line. Without fouling plugs or poor idling.

Reason I asked is the shorter 4" stroke might have liked a little more timing. I am with ya on the fuel stuff. A lean marine engine is a burnt marine engine! Either way, congrats on a nice build buddy!

05-17-2014 | 12:36 PM

#63

Borgie

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From: AZ

Did you go with a a18726543 firing order, or standard BBC?

05-17-2014 | 05:13 PM

#64

Rookie

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From: Grand Rapids, MI

Quote:

Originally Posted by Borgie

Did you go with a a18726543 firing order, or standard BBC?

I'm assuming if he used Bobs cam it is the 2/3 4/7 swap. I'm pretty sure they are designed off the new firing order mine from Bob were.

05-17-2014 | 05:18 PM

#65

Borgie

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From: AZ

Quote:

Originally Posted by Rookie

I'm assuming if he used Bobs cam it is the 2/3 4/7 swap. I'm pretty sure they are designed off the new firing order mine from Bob were.

Yeah seems he does quite a few of those these days, but not all. Mine is as well, thx!

05-17-2014 | 06:13 PM

#66

Unlimited jd

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From: Taunton Ma

The 548's cam is a bit more conservative. It was originally selected for a boat with reversion issues. It made 635 and 660tq

05-17-2014 | 06:14 PM

#67

MILD THUNDER

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From: chicago

Quote:

Originally Posted by lil red

The 548's cam is a bit more conservative. It was originally selected for a boat with reversion issues. It made 635 and 660tq

Nice numbers. Same 305cc as cast AFR with CNC chambers?

05-17-2014 | 07:21 PM

#68

242LS

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From: East Greenwich, RI

Quote:

Originally Posted by Rookie

I'm assuming if he used Bobs cam it is the 2/3 4/7 swap. I'm pretty sure they are designed off the new firing order mine from Bob were.

Standard. We had a mixup - so it will be swapped next time it gets open heart surgery (I hope that doesn't happen for a long time).

05-17-2014 | 08:25 PM

#69

tbanzer

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From: Angola NY

What is the top end valve train refresh interval on a cam that size?

05-17-2014 | 10:11 PM

#70

Unlimited jd

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From: Taunton Ma

Quote:

Originally Posted by MILD THUNDER

Nice numbers. Same 305cc as cast AFR with CNC chambers?

Yes same heads

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