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Search: Posts Made By: Alan454
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Forum: Do It Yourself, Boating on a Budget
09-08-2010, 02:04 PM
Replies: 8
Views: 1,474
Posted By Alan454

quench and comp ratio

Sorry to offer my 2 cents so late ... but

My understanding is that quench distance does indeed have a direct effect on detonation resistance due to the increased turbulence induced at low quench....
Forum: Do It Yourself, Boating on a Budget
03-05-2010, 05:01 PM
Replies: 9
Views: 2,267
Posted By Alan454

How do you turn the raw water pump? Don't see a...

How do you turn the raw water pump? Don't see a pulley for that on the site or different length belts to accommodate one.
Forum: Do It Yourself, Boating on a Budget
11-26-2009, 10:34 AM
Replies: 15
Views: 42,981
Posted By Alan454

I converted mine to closed cooling but I am in...

I converted mine to closed cooling but I am in salt water. Yes AF is slightly acidic and released scale and rust, but since you are in fresh water you probably don't have much. Another benefit is...
Forum: Prop Talk
10-14-2009, 12:49 PM
Replies: 12
Views: 1,630
Posted By Alan454

Asked wrong question

The engine torque I gave is flywheel torque, and is multiplied by the Bravo I gears.

600 ft-lbs * 1.36 = 816 ft-lb
600 ft-lbs * 1.5 = 900 ft-lb
600 ft-lbs * 1.65 = 990 ft-lb

Obviously...
Forum: Prop Talk
10-14-2009, 12:09 PM
Replies: 12
Views: 1,630
Posted By Alan454

Original HP is 330 (flywheel), rebuild Hp is...

Original HP is 330 (flywheel), rebuild Hp is going to be something over 450 Hp with between 550 and 600 ft-lb torque. I assume that the Flo-Torq II hub can handle this right as break-away is...
Forum: Prop Talk
10-10-2009, 12:21 PM
Replies: 12
Views: 1,630
Posted By Alan454

Brett - my current low cruise slip is about 28%...

Brett - my current low cruise slip is about 28% and 17% at WOT. I am adding over 125 HP though as I mentioned, and putting my boat on a diet so I won't have any baseline to start from. Can't use...
Forum: Prop Talk
10-08-2009, 11:01 PM
Replies: 12
Views: 1,630
Posted By Alan454

Yes - lots of variables

You guys are right that the efficiency of the boat as a whole is a function of quite a few variables. However, one component of this complex problem is the efficiency of the prop all by itself. The...
Forum: Prop Talk
10-07-2009, 08:13 PM
Replies: 12
Views: 1,630
Posted By Alan454

Mercury Efficiency Curves?

Does anybody know where I can find some efficiency curves of Mercury (or other) 14 5/8" dia 4 blade props vs advance ratio for some selected prop pitch's? Doesn't seem to be any info on this subject...
Forum: Do It Yourself, Boating on a Budget
09-27-2009, 01:09 PM
Replies: 7
Views: 2,178
Posted By Alan454

Note sure those exhaust reliefs do anything as...

Note sure those exhaust reliefs do anything as the seem to be cut at the wrong angle for the exhaust valve. I have them on my engine also and am going to replace with forged.

Take a look a few...
Forum: Do It Yourself, Boating on a Budget
09-22-2009, 04:50 PM
Replies: 12
Views: 2,216
Posted By Alan454

Was just talking to a guy at EMI, for their short...

Was just talking to a guy at EMI, for their short Aluminum or Stainless risers they recommend a maximum of 230 deg duration (050) on the exhaust. That cam is 236 deg. I have been told on this forum...
Forum: Do It Yourself, Boating on a Budget
09-19-2009, 12:07 AM
Replies: 5
Views: 9,258
Posted By Alan454

AJ – Just do a search on “how to degree a...

AJ – Just do a search on “how to degree a camshaft” and literally dozens will come up. I must say, I skimmed though a number of them but didn’t follow any of them exactly. For me, a picture is...
Forum: Do It Yourself, Boating on a Budget
09-16-2009, 10:22 AM
Replies: 5
Views: 9,258
Posted By Alan454

I got to looking carefully at the plots and...

I got to looking carefully at the plots and noticed something that I didn't like. The excel "area" plots don't have a constant X-axis scale. In fact I discovered most of the excel plots don't. I...
Forum: Do It Yourself, Boating on a Budget
09-14-2009, 09:18 PM
Replies: 5
Views: 9,258
Posted By Alan454

Measured Merc 7.4L 330Hp Cam Specs

Here are some measurements I made over the weekend of stock cam in a 7.4L 330 Hp Gen IV motor. The duration specs in the service manual were way off, but the lifts were very close. You can see...
Forum: Do It Yourself, Boating on a Budget
09-10-2009, 11:40 PM
Replies: 10
Views: 2,298
Posted By Alan454

Thanks guys! Yes all I am looking for is a rule...

Thanks guys! Yes all I am looking for is a rule of thumb to get a sense of where problems occur. Many factors appear to come into play. Sounds like that cam would likely be OK though. I do sense...
Forum: Do It Yourself, Boating on a Budget
09-09-2009, 10:26 PM
Replies: 10
Views: 2,298
Posted By Alan454

Exhaust duration @050 is 224 deg so I have about...

Exhaust duration @050 is 224 deg so I have about 6 deg margin.

I thought that it is the time that both valves are simultaneously open at the transition from exhaust to intake stroke (overlap)...
Forum: Do It Yourself, Boating on a Budget
09-08-2009, 08:10 PM
Replies: 8
Views: 12,763
Posted By Alan454

Here is some info from Dennis Moore on this forum...

Here is some info from Dennis Moore on this forum - can find the link again, but here is the info - hope it's not too late. Durations given at .050" lift, and lift at the valve of course. Seems like...
Forum: Do It Yourself, Boating on a Budget
09-08-2009, 07:44 PM
Replies: 10
Views: 2,298
Posted By Alan454

Thanks guys! Good point on leaving a bit for...

Thanks guys!

Good point on leaving a bit for a future cleanup if I go that route. I did a quick search on those Cometics and appear to be what I need if I can't get the block decked to the right...
Forum: Do It Yourself, Boating on a Budget
09-07-2009, 06:22 PM
Replies: 10
Views: 2,298
Posted By Alan454

Quench Distance Question

I am totally rebuilding a 454 and trying to select some pistons and set the static and dynamic compression ratios (SCR & DCR).

One of the many parameters to set is the quench distance. I have...
Forum: General Q & A
05-05-2007, 03:43 PM
Replies: 4
Views: 1,409
Posted By Alan454

Thanks for the fit info! I already have ARP's...

Thanks for the fit info! I already have ARP's for the stock heads hopefully they will fit except for the longer holes.

I have flat top pistons yielding a 8:1 comp ratio if I believe the manual -...
Forum: General Q & A
05-04-2007, 07:17 PM
Replies: 4
Views: 1,409
Posted By Alan454

Edelbrock Aluminum Heads

I have a stock Gen IV Merc 7.4L Bravo I with stock cast iron exhaust manifolds. My old cast iron heads are shot and I would like to replace them with Edelbrock Aluminum Performer RPM heads. ...
Showing results 1 to 20 of 20


 
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