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Search found 1147 matches

by englertracing
Fri Aug 19, 2022 1:27 pm
Forum: Engine Tech
Topic: 4 Valve Head: Single Central Spark Plug vs Dual Spark Plugs
Replies: 12
Views: 377

Re: 4 Valve Head: Single Central Spark Plug vs Dual Spark Plugs

I found this terrific technical analysis of the Ducati 1299 Panigale superbike engine. https://www.cycleworld.com/2015/01/26/ducati-1299-panigale-superbike-engine-technical-analysis-with-photos/ Its forebear, the 1199 Panigale, was characterized by a MONSTROUS differential between bore and stroke, ...
by englertracing
Thu Aug 18, 2022 5:39 pm
Forum: Engine Tech
Topic: Porsche 993 twin turbo
Replies: 61
Views: 1408

Re: Porsche 993 twin turbo

If you could find a 3.6,3.7, 3.8 final drive you could offset the drawbacks of larger turbos, bigger cams, etc. You can create more torque at the contact patch. Yes you will lose some top end, but the reality is, normal driving doesn't allow for speeds in excess of 150mph on a regular basis. The tw...
by englertracing
Thu Aug 18, 2022 3:43 am
Forum: Engine Tech
Topic: 4 Valve Head: Single Central Spark Plug vs Dual Spark Plugs
Replies: 12
Views: 377

Re: 4 Valve Head: Single Central Spark Plug vs Dual Spark Plugs

Ktms less powerful older rc8 engine used two plugs
3QEL2YLA2HSVYIKNVTS45EGJ3Y.jpg
I think it would be difficult to fit 3 because of Valvetrain
by englertracing
Wed Aug 17, 2022 1:42 pm
Forum: Engine Tech
Topic: Porsche 993 twin turbo
Replies: 61
Views: 1408

Re: Porsche 993 twin turbo

Here's a question about turbo lag. When I read posts about turbo lag, I never know exactly is the accepted forum definition of turbo lag. None of the _street_ turbo cars that I've worked have any appreciable turbo lag to speak of in the following sense: When you're driving hard and shifting near th...
by englertracing
Tue Aug 09, 2022 1:15 am
Forum: Engine Tech
Topic: tips for valve seat freshen up - Methanol
Replies: 15
Views: 518

Re: tips for valve seat freshen up - Methanol

You sure you want to embed abradables into a soft seat that a 150$ valve touches? Possibly not, hadn't thought about that as an issue. Just saw that Goodsons had a cool blue stone that they say is for for beryllium seats so was planning to use those. I'd really appreciate your input though on how i...
by englertracing
Mon Aug 08, 2022 11:36 pm
Forum: Engine Tech
Topic: tips for valve seat freshen up - Methanol
Replies: 15
Views: 518

Re: tips for valve seat freshen up - Methanol

You sure you want to embed abradables into a soft seat that a 150$ valve touches?
by englertracing
Sat Aug 06, 2022 2:49 am
Forum: Engine Tech
Topic: Drilling holes in head gaskets = more flow = lower temps: Change My Mind!
Replies: 43
Views: 1490

Re: Drilling holes in head gaskets = more flow = lower temps: Change My Mind!

It is for distributing coolant flow evenly/ directing it to where it's needed most like exhaust side of head, siamesed exhaust ports need priority. "But back in the 60s and 70s, when people just LEARNED BY DOING, they did this "and it worked"!" Adam Yeah a friend of mine liked to tell me in the 60s...
by englertracing
Fri Aug 05, 2022 6:28 pm
Forum: Engine Tech
Topic: Drilling holes in head gaskets = more flow = lower temps: Change My Mind!
Replies: 43
Views: 1490

Re: Drilling holes in head gaskets = more flow = lower temps: Change My Mind!

It is for distributing coolant flow evenly/ directing it to where it's needed most like exhaust side of head, siamesed exhaust ports need priority.
by englertracing
Wed Aug 03, 2022 11:11 pm
Forum: Engine Tech
Topic: Longevity of flat plane crank engine?
Replies: 19
Views: 948

Re: Longevity of flat plane crank engine?

And to better mimic a ferrari like they were going for
by englertracing
Tue Aug 02, 2022 12:35 pm
Forum: Engine Tech
Topic: Why Does Speedway Use One Gear But Flat Track Uses Multiple Gears?
Replies: 4
Views: 316

Re: Why Does Speedway Use One Gear But Flat Track Uses Multiple Gears?

Flat track bikes come with transmssioms.transmissions..



Ps speedways cousin grass track bikes do use a 2 speed
by englertracing
Sun Jul 24, 2022 7:05 pm
Forum: Engine Tech
Topic: Intake closing
Replies: 130
Views: 3827

Re: Intake closing

Some builders (certainly one in particular) state that the LSA is the single most important camshaft spec for greatest torque output all else being equal (as in RPM ) . Tailor the valve events to fit around that. Which is pretty simple when you think about. Say a 108 LSA is best. Then an IVC that's...
by englertracing
Thu Jun 16, 2022 3:42 am
Forum: Engine Tech
Topic: Short Pushrods and Tall RPMs in Real World Performance
Replies: 23
Views: 1255

Re: Short Pushrods and Tall RPMs in Real World Performance

If the port limits high rpm power the valvetrain that produces more area under the curve will should run better. Generally speaking.
by englertracing
Mon Jun 06, 2022 8:08 pm
Forum: Engine Tech
Topic: Why Not Use A Tungsten Flywheel For Flat Track Racing?
Replies: 13
Views: 860

Re: Why Not Use A Tungsten Flywheel For Flat Track Racing?

I’m told that making the rear wheel into a big flywheel became so common in US flat-track that AMA Pro Racing has now set a maximum wheel weight. In response, teams do what they can to lighten the hub part of the weight so they can locate more weight at the rim, sometimes even utilizing an inner tu...
by englertracing
Mon Jun 06, 2022 8:06 pm
Forum: Engine Tech
Topic: Why Not Use A Tungsten Flywheel For Flat Track Racing?
Replies: 13
Views: 860

Re: Why Not Use A Tungsten Flywheel For Flat Track Racing?

Tungsten has an extremely high hardness and is difficult to machine. A tungsten flywheel would be very expensive to produce, but not impossible. Not flat track racing but dirt late model racing: A few years ago the trick of the week was to add weight to the LR axle tube and or the LR wheel. I know ...
by englertracing
Mon Jun 06, 2022 8:03 pm
Forum: Engine Tech
Topic: Why Not Use A Tungsten Flywheel For Flat Track Racing?
Replies: 13
Views: 860

Re: Why Not Use A Tungsten Flywheel For Flat Track Racing?

AMA Flat Track racers were using a heavy rear wheel, which I also believed helped with handling balance issues, let alone better traction. There is a weight limit now as mentioned above. I do believe they use heavy iron rotors though. Issue 129 of Race Engine Technology did a deep dive dossier of V...