Hi fellas.

I just got myself a boat. She is a 5m C-Craft fibreglass tunnel hull with a 253V8.

It has the standard carby and intake on it and goes bloody well but lacks a bit in top end IMO.

Flat out she does 42km/hr but the engine is only revving a bit over 3,000rpm. At this rpm, the motor would barely be seeing power band.

In the top end, there is very little difference between flat out and the throttle backed back. Flat out the motor bogs a bit like the mix aint quite right.

Question is, does anyone have much experience with the 253 motor? I could put a smaller prop on it to see if I find that hidden power with a few more revs, but it feels about right when cruising. It cruises nicely at 2500rpm.

One day I'd like to try a better intake and a 600 holley, but would like to keep reasonable fuel ecconomy.

Any thoughts?

choco said...

We used to call the old 253's Yabby motors all shell and no guts.

Does anyone know if a 308 intake manifold will fit on a 253 then?

thommo 000 said...

You`ll need a red 308 manifold from around the same era as your engine,provided of course it doesn`t have blue heads on it. A 308 manifold will bolt straight onto a 253

Will still have a two barrel or four thommo? Wernt they standard two? 308s that is?

thommo 000 said...

four

What carb on the four barrel then carter?

A Hollie with an adaptor plate to give a bit more stick 600cfm with vacum secondaries should do the trick. Ive seen on some ski boats that they have a carb adaptor thats on an slight angle so the carb is horizontal so the floats read correctly. That should wake the two flies and a bee up

Mini blown chev

walshd said...

Hi fellas.

I just got myself a boat. She is a 5m C-Craft fibreglass tunnel hull with a 253V8.

It has the standard carby and intake on it and goes bloody well but lacks a bit in top end IMO.

Flat out she does 42km/hr but the engine is only revving a bit over 3,000rpm. At this rpm, the motor would barely be seeing power band.

Any thoughts?

Yes.

Why would you buggerise around with all that stuff (5m C-Craft fibreglass tunnel hull with a 253V8) plus trailer for the sake of 42kmh, when a Zodiac 3.1 m inflateable with a Mariner 15hp on the back (legal that hp and 4 people) will do 3kmh more and you can fir it into the boot of your car.

This ( 5m C-Craft fibreglass tunnel hull with a 253V8 ) when turned turtle and filled with water has only one direction it will go without air bags and we know what that is don't we??

Whereas this (Zodiac 3.1 m inflateable with a Mariner 15hp on the back ) in the same circumstances will remain fairly stationary (subject to wind and tide conditions) while you get your act together from which situation it may be possible to continue the speed fun if the motor has not been completely drowned or get back to dry land using the sheilas (oars).

One has to ask what the purpose of the excercise is here. Is it towing water skiers or scurfers? The Mariner could probably handle one. Maybe it is just going fast on the water. I love it in a minimalist way. Every yacht needs a Zoomer.

Hopefully your motivation is not this male, macho, V8, phallic extension thing that posesses these jerk offs that roar around our neighbourhood in their (usually black) wankey utes.

You asked for "Any Thoughts". To understand mine, a sense of reality AND the ridiculous may be required.

Whatever you do, make sure you have fun and don't get serious because none of us are going to get out of this LIFE thing alive. It ain"t a rehearsal. Cheers Cisco.

We get lots of these things around here:








While fishing for these:

Inflateables certainly don't like spikey things and yes, I would be wanting 6m of solid boat between me and that big thing hanging by the rope around it's tail.

Best of luck with the donk issue.

Sailhack said...

Nice king & mako (around 200kg?)...although the 'pinkies' look a little undersize for your area?

Na it is a white that one of the pros got in their longline.

I'm planning a fishing trip maybe over your way in the next year with a couple of mates, we're trying to decide whether we go to Whyalla, Freo or Darwin...although after my father (grey nomad) recently returned from NT, reckons the sharks are too much hassle. Here, we try to catch them!

Well since your victorian, I'd say go to Freo or Darwin. There are already too many mexicans coming over here and poaching our snapper.

If you do decide to visit Whyalla, get on a charter. They have their own drops that don't get raped by the tourists.

I might grab my mates tuning kit and have a play on the weekend If I get bored.

Cheers guys, I'll read up on the manual and check the timing.

Hopefully it doesn't have any adverse affects because it starts and runs beautifully. Better mark what everything is set at before playing with it.