We are currently running on the new domain and server: www.Speed-Talk.com

IMPORTANT: Update your bookmarks to https://www.speed-talk.com/forum/
(Right-click the URL and select "Bookmark this link")

Search found 324 matches

by Calypso
Sun Dec 01, 2019 11:24 pm
Forum: Engine Tech
Topic: How to fight exhaust reversion when the primaries are way too short
Replies: 142
Views: 9905

Re: How to fight exhaust reversion when the primaries are way too short

Curiously Coyote seems to have a firing order of 1-5-4-8-6-3-7-2. So there is only one instance of firing adjacently in the same bank: 8-6 ? And the distance between 8-6 in the manifold seems lengthy. What am I missing? I don’t have the coyote numbering convention memorized, but both banks must alw...
by Calypso
Sun Dec 01, 2019 4:12 pm
Forum: Engine Tech
Topic: How to fight exhaust reversion when the primaries are way too short
Replies: 142
Views: 9905

Re: How to fight exhaust reversion when the primaries are way too short

Curiously Coyote seems to have a firing order of 1-5-4-8-6-3-7-2. So there is only one instance of firing adjacently in the same bank: 8-6 ? And the distance between 8-6 in the manifold seems lengthy. What am I missing?
by Calypso
Sun Dec 01, 2019 7:57 am
Forum: Engine Tech
Topic: How to fight exhaust reversion when the primaries are way too short
Replies: 142
Views: 9905

Re: How to fight exhaust reversion when the primaries are way too short

What’s unknown to me is how the various merge angles etc influence the issue. Koenigsegg and LS7 manifolds seem to suggest that collector with parallel inlets/flow paths and no choke that is directed towards the cat or the turbine somehow works well. Old, but good thread... Wondering if paralleleli...
by Calypso
Sun Nov 24, 2019 3:29 pm
Forum: Engine Tech
Topic: Subaru EJ25 combustion chamber to do / not to do
Replies: 68
Views: 6353

Re: Subaru EJ25 combustion chamber to do / not to do

Been years and going by the memory, but I faintly recall rollerwave pistons having slightly different quench clearances in the intake and exhaust side, which was part of the idea of creating a "rollerwave" combustion.
by Calypso
Sun Nov 24, 2019 1:42 am
Forum: Engine Tech
Topic: Brushable heat barrier coating?
Replies: 16
Views: 2511

Re: Brushable heat barrier coating?

If you want to experiment a bit, you might try a slurry of aluminum metal powder and sodium silicate mixed together and then fired in a pottery kiln. The aluminum powder, "burns/flashes", to aluminum oxide along with combining with the silica in the sodium silicate if not mistaken. There was/is(?) ...
by Calypso
Sat Nov 16, 2019 4:59 am
Forum: Engine Tech
Topic: Strange power valve
Replies: 5
Views: 364

Strange power valve

Anyone know what this is?

Stampings 12 & C-8
06559CB2-1CA8-4714-B8FF-3FF8F9FE5094.jpeg
765C0810-C015-454C-89FC-C6FE8D3F29E2.jpeg
F4466A1A-101E-4BF1-9756-88A36E3E2CF3.jpeg
by Calypso
Sun Nov 10, 2019 3:16 am
Forum: Engine Tech
Topic: 347 Ford Sniper EFI cam specs
Replies: 11
Views: 550

Re: 347 Ford Sniper EFI cam specs

The reason I get concerned with the EFI though, is even with a wideband O2 sensor, if system doesn't have an input or a control to manage raw fuel hitting the O2 sensor during overlap, the O2 sensor thinks it's rich. Overlap flow from narrow LSA will show lean on the WB Oxygen sensor. The sensor me...
by Calypso
Wed Sep 05, 2018 3:30 am
Forum: Engine Tech
Topic: cordless impact wrenches & drivers
Replies: 24
Views: 2286

Re: cordless impact wrenches & drivers

Big and small Makita’s. The best cordless tool investment I’ve ever made. Used them for years already and couldn’t do without.
by Calypso
Mon Jul 30, 2018 3:25 am
Forum: Engine Tech
Topic: Basic Ferrea Intake Valve Questions
Replies: 17
Views: 1774

Re: Basic Ferrea Intake Valve Questions

In the 60’s Ford used tuliped valve profile for durability in hi rpm endurance 427 application despite losing flow. In cammer, the same profile gained flow.
Materials and valvetrains in general have progressed a lot since. Whether anyone would do this today IDK.
by Calypso
Sat Jul 28, 2018 11:49 am
Forum: Chassis / Suspension / Body
Topic: TALL BALL JOINTS
Replies: 12
Views: 3764

Re: TALL BALL JOINTS

If increased camber gain would be an advantage in the application, then yes.
by Calypso
Tue Jul 24, 2018 2:25 am
Forum: Engine Tech
Topic: How are limitations of dwell over nose estimated?
Replies: 136
Views: 9719

Re: How are limitations of dwell over nose estimated?

To OP: dwell in the cam parameters or “dwell “ as if car hangs on after peak power?
by Calypso
Wed Jul 18, 2018 3:16 pm
Forum: Engine Tech
Topic: Combustion Chamber Buildup
Replies: 39
Views: 2908

Re: Combustion Chamber Buildup

Many seriously think fuel washes the chamber, because you can wash parts with it... Even if black on plug porcelain is undeniably rich sign. Apply 900,000 cycles of unclean (rich) burn on fuel wetted surfaces by running 2500rpm for just 12hrs on street, there’s bound to be some carbon residue left. ...
by Calypso
Tue Jul 17, 2018 3:26 pm
Forum: Engine Tech
Topic: Temperature management questions for a turbo engine
Replies: 44
Views: 2123

Re: Temperature management questions for a turbo engine

Perhaps a little simplistic add on to the list is increasing the oil capacity. Got two turbo oil sumps and two big coolers, plus an oil pan spacer. The regular sump volume in the pan is hard to increase, but I can stash some oil in the turbo sumps, lines, and big external coolers. The only limit th...
by Calypso
Tue Jul 17, 2018 3:00 pm
Forum: Engine Tech
Topic: Temperature management questions for a turbo engine
Replies: 44
Views: 2123

Re: Temperature management questions for a turbo engine

Perhaps a little simplistic add on to the list is increasing the oil capacity.
by Calypso
Tue Jul 17, 2018 1:36 am
Forum: Engine Tech
Topic: 1960's engine wars
Replies: 108
Views: 6811

Re: 1960's engine wars

With modern valvetrains, would Boss 429 with higher lift potential fall behind Cammer in endurance application?