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Search found 86 matches

by Momus
Sun May 31, 2020 4:50 am
Forum: Engine Tech
Topic: Fiat twin cam - starting head gasket failure?
Replies: 15
Views: 539

Re: Fiat twin cam - starting head gasket failure?

For someone that pretty much builds just Fiat and Alfa classic engines....I assure you they are chalk and cheese! I can assemble a Fiat twincam in half the time. The Alfa is an older design but all alloy with iron sleeves. And alloy head. Fiat has a cast iron block and alloy head with a better more...
by Momus
Fri May 22, 2020 2:39 am
Forum: Engine Tech
Topic: Cylinder wall thickness ,,, again :)
Replies: 11
Views: 707

Re: Cylinder wall thickness ,,, again :)

How far down is it, far enough to leave it alone & live with it's affect/effect? Its a little over an 1 1/2" down. I personally would not want the rings passing over it every rev. Lol mate :shock: :lol: :lol: . Have a look inside a racing 2 stroke sometime to see what is a fair gap for a ring to cl...
by Momus
Wed Apr 01, 2020 10:31 am
Forum: Engine Tech
Topic: Big block road race build 572
Replies: 51
Views: 2034

Re: Big block road race build 572

Way too much low and midrange for a Thundersports circuit racer. :roll:

Which track in NZ has a 200 mph top speed?

That chassis/tyres will be so overpowered it will be undriveable.
by Momus
Sat Mar 28, 2020 5:35 am
Forum: Engine Tech
Topic: Unsure what to do with 0.0020" Main Clearance
Replies: 66
Views: 2908

Re: Unsure what to do with 0.0020" Main Clearance

Run it. Will be fine.

At the moment with all the crap there could be a logistics issue sending it out or any number of QA adverse possibilities
trying to correct such a small error.
by Momus
Thu Mar 26, 2020 2:05 am
Forum: Engine Tech
Topic: Excessive crankshaft end play
Replies: 9
Views: 836

Re: Excessive crankshaft end play

There are many import engines 4 and 6 cylinder that have only 1/2 a thrust bearing usually located in the block. With a turbo these engines can make 200/250 hp per cylinder and have no thrust bearing problem. And there are modern present day V/8 and V/6 engines setup the same way with only 1/2 a th...
by Momus
Sat Mar 21, 2020 12:59 pm
Forum: Engine Tech
Topic: Excessive crankshaft end play
Replies: 9
Views: 836

Re: Excessive crankshaft end play

What is the engine?

Wear and bad grinding tolerances.

Some engines have oversize thrust bearings.

There are shaft repair methods.
by Momus
Thu Feb 27, 2020 2:04 am
Forum: Engine Tech
Topic: Nothing like a good head...
Replies: 23
Views: 2496

Re: Nothing like a good head...

You done good, that is a damn fine street engine! There is a mob in enzed working on billet alloy blocks that'll go 250+ cubes. Cheers Tony... Those billet blocks look outstanding... They are long over-due... I'd love a 250ci red motor with JZED and 55mm webers on e85. I think with the right R&D so...
by Momus
Thu Feb 27, 2020 2:01 am
Forum: Engine Tech
Topic: Welded piston domes
Replies: 9
Views: 1109

Re: Welded piston domes

In about 1975 when working at a motorcycle dealership we had a 2 stroke Yamaha 400 brought in after it holed a piston on the highway. The Swedish traveller gave us the OK and the piston was cleaned up, oxy acetylene puddle welded, reinstalled and off it went apparently for thousands more kilometres....
by Momus
Wed Feb 26, 2020 11:14 am
Forum: Engine Tech
Topic: Best race valve material
Replies: 35
Views: 2789

Re: Best race valve material

Good point. People have found that just using a torque plate while cutting the seat makes a difference. I was reading of a builder's heavily-ported Alfa Romeo 2.0 L. After doing a 'perfection' valve job and assembling the head, he stood it with ports up (can't remember if it was intake, exhaust or ...
by Momus
Tue Feb 25, 2020 11:58 am
Forum: Engine Tech
Topic: Nothing like a good head...
Replies: 23
Views: 2496

Re: Nothing like a good head...

Nice work lc.

There must be just about enough demand to make a heavy duty nodular iron Holden 6 block an aftermarket goer- regardless of the CAMS sanctioned circuit classes probably not being allowed to use them.

I would love to see a 9000+ rpm 450 hp red that didn't tear itself up.
by Momus
Tue Feb 25, 2020 11:52 am
Forum: Engine Tech
Topic: Piston ring modifications
Replies: 17
Views: 1155

Re: Piston ring modifications

BILL-C wrote:
Tue Feb 25, 2020 6:40 am
Total seal sells rings like that already machined.
That certainly answered all the OP's queries Bill.

I am interested as well if anyone has some actual info.
by Momus
Sat Feb 22, 2020 2:30 pm
Forum: Engine Tech
Topic: Cam cap material and design
Replies: 8
Views: 2351

Re: Cam cap material and design

No. Ergal/7075 is ideal. The cam should not be contacting the cap if the lubrication is right.
by Momus
Thu Feb 06, 2020 1:49 am
Forum: Engine Tech
Topic: Silicone RTV for molds?
Replies: 8
Views: 668

Re: Silicone RTV for molds?

The pink, 2 part stuff they sell in the sex shops works well for ports. :D
You do have to work quickly and not over catalyse.
by Momus
Fri Jan 31, 2020 8:43 am
Forum: Engine Tech
Topic: single compression ring piston
Replies: 32
Views: 1975

Re: single compression ring piston

Yes.
by Momus
Sun Jan 26, 2020 8:47 am
Forum: Engine Tech
Topic: stainless steel bellmouths sources
Replies: 5
Views: 522

Re: stainless steel bellmouths sources

I've made many bell mouths using a steel die that is the male form of the tube end you want on an arbor press.

The radius needs to be about 150 to 180 degrees and you need a push end plug.