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Search found 2003 matches

by Truckedup
Sat Nov 16, 2019 12:24 pm
Forum: Engine Tech
Topic: Mikuni carbs vs. injected ITBs
Replies: 29
Views: 604

Re: Mikuni carbs vs. injected ITBs

Yes, I saw that SAE net was comparable to the Brake hp used in the UK. I initially wanted to compare to the even lower power ratings of later US Market cars but they were no longer using SU carbs. I only had personal experience with SU carbs on the Series 1 XJ6 that I owned. 73 MG may be the last y...
by Truckedup
Sat Nov 16, 2019 12:23 pm
Forum: Engine Tech
Topic: Mikuni carbs vs. injected ITBs
Replies: 29
Views: 604

Re: Mikuni carbs vs. injected ITBs

Yes, I saw that SAE net was comparable to the Brake hp used in the UK. I initially wanted to compare to the even lower power ratings of later US Market cars but they were no longer using SU carbs. I only had personal experience with SU carbs on the Series 1 XJ6 that I owned. 73 MG may be the last y...
by Truckedup
Sat Nov 16, 2019 9:00 am
Forum: Engine Tech
Topic: Mikuni carbs vs. injected ITBs
Replies: 29
Views: 604

Re: Mikuni carbs vs. injected ITBs

On my vintage Triumph street and land speed racers I have had excellent results with Mikuni TM flatslides. The 34 MM's are about 135 bucks each and work quite nicely with leaner mixutures and sharp throttle response.. On the track they don't seem sensitive to changes in air density...As always, no m...
by Truckedup
Fri Nov 15, 2019 5:41 am
Forum: Engine Tech
Topic: Mikuni carbs vs. injected ITBs
Replies: 29
Views: 604

Re: Mikuni carbs vs. injected ITBs

Momus wrote:
Fri Nov 15, 2019 1:49 am
englertracing wrote:
Thu Nov 14, 2019 10:36 am
Keihin FCR carburetors are much nicer than the mikunis, but the largest you can get is 41mm
I concur. I've used the Mikunis and the Keihin FCR's win hands down. If only there was a 48 or 50 mm version.
What makes you say the FCR's are far better?
by Truckedup
Thu Nov 14, 2019 4:18 pm
Forum: Engine Tech
Topic: Mikuni carbs vs. injected ITBs
Replies: 29
Views: 604

Re: Mikuni carbs vs. injected ITBs

PackardV8 wrote:
Thu Nov 14, 2019 2:49 pm
I wasted some of the best years of my young life trying to make those buzzing little anvils go faster.
:D :D :D I hear you on that British stuff...
by Truckedup
Thu Nov 14, 2019 2:06 pm
Forum: Engine Tech
Topic: Mikuni carbs vs. injected ITBs
Replies: 29
Views: 604

Re: Mikuni carbs vs. injected ITBs

A single 42MM Mikuni HSR can support 100 RWHP @ 7000 rpm on a Harley...
by Truckedup
Thu Nov 14, 2019 7:00 am
Forum: Engine Tech
Topic: Mikuni carbs vs. injected ITBs
Replies: 29
Views: 604

Re: Mikuni carbs vs. injected ITBs

I use Mikuni flatslides on my racing and street bikes....Like all flatslides,they have fantastic throttle response...Tuning them is easy if you have a clue to what jets, needles etc to use as a starting point... I agree with Jack on the silly HP gains..it would only be possible if the other carbs we...
by Truckedup
Mon Nov 11, 2019 8:22 pm
Forum: Engine Tech
Topic: Modern Engines & Static CR vs. Boost Levels?
Replies: 32
Views: 955

Re: Modern Engines & Static CR vs. Boost Levels?

You have to remember that the numbers for Avgas (100LL, 80/87, 100/130, 115/145 etc) do not represent octane numbers the same way we usually think of them nor directly the MON/RON numbers published by autogas suppliers. Yes, and for instance the 100 is lean burn octane and the 130 is rich burn...No...
by Truckedup
Sat Nov 09, 2019 7:42 pm
Forum: Engine Tech
Topic: Senate Bill on Racing
Replies: 30
Views: 1737

Re: Senate Bill on Racing

Seems like the basic issue is the failure to recognise that a vehicle modified from street legal to non-street legal race car is no longer serving as a transportation device and thus is not contributing to that element of climate change. I.e., if it is replaced at all for that purpose, it is must b...
by Truckedup
Sat Nov 09, 2019 11:49 am
Forum: Engine Tech
Topic: Modern Engines & Static CR vs. Boost Levels?
Replies: 32
Views: 955

Re: Modern Engines & Static CR vs. Boost Levels?

The old school way (think WWII bombers) of combating high cylinder pressure and heat, was more octane. I’ve read that fully loaded bombers were using leaded fuel in excess of 150 octane. Yikes! No different than 60s muscle cars.. the knowledge and computational / engineering ability wasn’t there to...
by Truckedup
Sat Nov 09, 2019 6:27 am
Forum: Engine Tech
Topic: Senate Bill on Racing
Replies: 30
Views: 1737

Re: Senate Bill on Racing

I live in NY and got this response from Democrat Senatoe Schumer. Thank you for contacting me to express your support for the Recognizing the Protection of Motorsports Act. I agree that a balance must be struck between the rights of hobbyists and the need to protect the environment. The Clean Air Ac...
by Truckedup
Tue Nov 05, 2019 9:03 am
Forum: Engine Tech
Topic: mahle piston failure
Replies: 24
Views: 1692

Re: mahle piston failure

Looks like the piston has been subjected to way too much heat, which has actually melted the top of the piston adjacent to the valve relief. Look for detonation and preignition. I'm familar with pre ignition damage on air cooled bike engines...it usual occurs in the center of the piston, very sudde...
by Truckedup
Sat Nov 02, 2019 6:48 am
Forum: Engine Tech
Topic: Spark plugs...again
Replies: 8
Views: 772

Re: Spark plugs...again

They last longer in applications using an HEL type of ignition. MSD systems tend to wear out conventional plugs faster then the others but that said I have seen in marine engines switching them to the new style iridium plugs the timing needs to get backed up 2 degrees as the spark timing seems to b...
by Truckedup
Fri Nov 01, 2019 12:55 pm
Forum: Engine Tech
Topic: Spark plugs...again
Replies: 8
Views: 772

Re: Spark plugs...again

Yeah, maybe some dyno or track info would be helpful.... I was using NGK fine wire "gold" plugs in my vintage land speed race bike...I switched to NGK Competions plugs, a conventional style with a cut back ground electrode and the bike ran the same speed or even a bit better...
by Truckedup
Fri Nov 01, 2019 7:17 am
Forum: Engine Tech
Topic: Spark plugs...again
Replies: 8
Views: 772

Spark plugs...again

Anyone here have experience reguarding iridium plugs compared to conventional plugs in a non emissions engine ? Can you say other than plug life, does the Iridium have any advantage in a mildly modified street engine? Thanks