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Search: Posts Made By: chunk t
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07-12-2013, 06:42 PM
Replies: 21
Views: 4,457
Posted By chunk t

I chuck up the piston and single point cut the...

I chuck up the piston and single point cut the circumfrance of the piston about .125" below the piston face and again .0625" below the first cut. Make the cut .005-.007 deep with a 45-degree point...
07-07-2013, 07:21 PM
Replies: 21
Views: 4,457
Posted By chunk t

I've taken a different view to pinching, I don't...

I've taken a different view to pinching, I don't touch the sleeve I swell the piston by "ringing" it on a lathe. I do this for two reasons. first, I don't like to lift the head on a sleeve that's...
Forum: RC Boating
01-24-2011, 07:24 PM
Replies: 4
Views: 769
Posted By chunk t

need to see the insides and business end...

need to see the insides and business end (transome) to be of any help.
Forum: RC Boating
01-24-2011, 07:22 PM
Replies: 4
Views: 3,381
Posted By chunk t

nitro or EP, "optimal" RPM is dictated by the...

nitro or EP, "optimal" RPM is dictated by the prop. Each prop has a sweet spot. The trick then becomes determining if your set-up (batt/motor or Engine) is apropriate for turning that prop at the...
01-24-2011, 07:14 PM
Replies: 8
Views: 1,998
Posted By chunk t

I'd question that excess oil is the root cause of...

I'd question that excess oil is the root cause of the leak. Oil has a lower viscosity than crankcase gases and is harder to work through a leaky seal. So in my book the oil is a benefit in your...
01-24-2011, 07:05 PM
Replies: 5
Views: 959
Posted By chunk t

good question.

good question.
01-24-2011, 07:02 PM
Replies: 6
Views: 1,474
Posted By chunk t

I've got a Duratrax truck and it sounds like your...

I've got a Duratrax truck and it sounds like your describing a really loose slipper clutch:nod: Just tighten the nut on the really big plastic gear a 1/2-turn at a time until you get the behavior...
01-24-2011, 06:57 PM
Replies: 12
Views: 11,116
Posted By chunk t

+1 SMCCOLP I use a failsafe on all of my...

+1 SMCCOLP

I use a failsafe on all of my boats and trucks. a 50+mph boat with a whirling prop is nothing you want to see heading toward people; and an equally fast car can sure bite an ankle...
Forum: RC Boating
09-18-2010, 04:45 PM
Replies: 1
Views: 745
Posted By chunk t

TJ you can use whatever size fuel tank you...

TJ

you can use whatever size fuel tank you like; as long as there is room in the hull (locate it near the CG). Being a 31" mono, you will be using a 3.5cc O/B. 6oz will get you about 8 min run...
05-07-2010, 08:16 PM
Replies: 2
Views: 632
Posted By chunk t

It's a little more than that, but in general...

It's a little more than that, but in general Slider is correct.

The header length affects & scavanging - the process of purging the spent gasses from the combustion chamber and drawing in the...
05-07-2010, 08:03 PM
Replies: 3
Views: 1,100
Posted By chunk t

I do a blow test on the engine. I pull the...

I do a blow test on the engine. I pull the engine out of the vehicle, remove the header, keep the plug installed, rotate the crank until the intake port is exposed in the carb. Cover the exhaust...
Forum: RC Boating
05-07-2010, 07:47 PM
Replies: 5
Views: 2,719
Posted By chunk t

You're right, boat information is sparce compared...

You're right, boat information is sparce compared to cars/trucks/truggies.

Making a boat fast depents on 1) hull set-up; balance & trim 2) engine set-up; needle & pipe 3) prop choice. Change any...
Forum: RC Boating
05-05-2010, 07:21 PM
Replies: 6
Views: 1,524
Posted By chunk t

I run a B-mod tunnel (3.5cc mod) on a modified...

I run a B-mod tunnel (3.5cc mod) on a modified 29" WOF hull & a B-mod mono. Both are scratch built. B-mod means .21 (3.5cc) displacement with modifications per IMPBA rules
Forum: RC Boating
03-21-2010, 05:30 PM
Replies: 7
Views: 5,053
Posted By chunk t

I know I'm late on this but two things jump out...

I know I'm late on this but two things jump out at me. One is the turn fin, it's WAY too far forward. Second, if you want to improve stability, some strakes on the inderside would go a long way. ...
Forum: RC Boating
01-13-2010, 07:42 PM
Replies: 4
Views: 2,394
Posted By chunk t

This is a late reply, but... You set the...

This is a late reply, but...

You set the temp by tuning the engine's needle, pipe and water intake (if water cooled). Listen, watch and make note of what is happening. Temp gauges must be used...
10-25-2009, 05:38 PM
Replies: 1
Views: 493
Posted By chunk t

I've never been able to get a rebuilt recoil to...

I've never been able to get a rebuilt recoil to last very long so I've just buy new ones as needed. Recoils are available direct from Tower Hobbies or on ebay pretty cheep $15-$20
10-25-2009, 05:34 PM
Replies: 2
Views: 440
Posted By chunk t

Washers are stamped and can end up with a bur or...

Washers are stamped and can end up with a bur or lip on one side if they are not sufficiently tumbled (de-burred). Personally I've always run the cowlet against the bearing without the use of a...
Forum: RC Boating
08-26-2009, 10:43 AM
Replies: 4
Views: 7,434
Posted By chunk t

I have fond memories of the li'l swamp buggy. ...

I have fond memories of the li'l swamp buggy. With a 6/4 prop on a basic Cox engine, they can zip along nicely.

Thinning epoxy. you will us a a ratio of 2:1 (eopxy:alcohol ...mix epoxy pats A &...
Forum: RC Boating
08-25-2009, 10:33 AM
Replies: 4
Views: 7,434
Posted By chunk t

I'll start by asking what kit do you have? That...

I'll start by asking what kit do you have? That would help me be a bit more specific in giving you a reply.

Generally speaking you would...

1. use a water/fuel proof wood glue (pick your...
07-30-2009, 10:59 AM
Replies: 6
Views: 448
Posted By chunk t

As the piston slides through the pinch the...

As the piston slides through the pinch the bearings are getting loaded. I would give the bearings a serious look at. Pull the p&s and turn the crank over. Check for play & roughness.
07-26-2009, 03:00 PM
Replies: 4
Views: 562
Posted By chunk t

Hey Nord, Just keep in the back of your mind...

Hey Nord,

Just keep in the back of your mind that Sean's link relates to two-strokes dependent upon an outside ignition source. Nitro engines are auto igniting engines, and dependent upon correct...
07-20-2009, 10:56 AM
Replies: 2
Views: 10,222
Posted By chunk t

"Pipes" as most hobbists call them are pretty...

"Pipes" as most hobbists call them are pretty straight forward. This is a REALLY generalized explanation.

There are two components:
1. the header - the constant diameter tube that joins the...
Forum: RC Boating
07-19-2009, 04:52 PM
Replies: 9
Views: 3,596
Posted By chunk t

Actually.... the CMB, Picco & Rossi marine...

Actually.... the CMB, Picco & Rossi marine engine blocks began life as car/buggy engines :nod:. K & B went the opposite way and took a marine engine and adapted it for road use.

As to the...
07-18-2009, 08:48 PM
Replies: 17
Views: 13,322
Posted By chunk t

Semple, you're a man after my own heart. Listen...

Semple, you're a man after my own heart. Listen to Monty, he's got a good head on his shoulders (we've swapped a few PM's). Most of my mod'ing is for my boat engines & I've done some to car engines...
Forum: RC Boating
07-13-2009, 10:51 AM
Replies: 9
Views: 3,596
Posted By chunk t

A nitro boat will use similar support gear as a...

A nitro boat will use similar support gear as a car of airplane (glow ignitor, starter (if not equiped w/recoil), fuel (30%+).) Beyond that, all boats need hatch tape to seal the radio box, grease...
Showing results 1 to 25 of 203
 


 
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