What stops an engine revving?

Message

1300dolly · #16 Post by **1300dolly** » Sat Jan 13, 2007 6:29 pm

stop it you're scarring me can i go now please.
i come here so i dont have to think.

DavePoth · #17 Post by **DavePoth** » Sat Jan 13, 2007 6:39 pm

So in essence, get a sprint?

Lewis · #18 Post by **Lewis** » Sat Jan 13, 2007 6:48 pm

Yup! multivalve systems are an excellent way to improve the VE of a piston engine!

I was reading about Hemi tuning recently and some of the competition engines (6+ litres) revved past 10,000RPM at which point "They started sounding a bit funny"

Excellent bits of engineering they were!

Sorry 1300 dolly

http://www.youtube.com/watch?v=6OUlsitO64E

Have this video of a VW 16 valve revving to 10,000RPM instead

OR this VTEC doing it's thing

http://www.youtube.com/watch?v=hzW8ECb5xWk

xvivalve · #19 Post by **xvivalve** » Sat Jan 13, 2007 8:30 pm

You notice that Polo wasn't strapped down, be fun to see it rise off the rollers at 10k; make a mess of that fan!

Adam, how on earth can you determine what RPM you are doing with a tachometer that inaccurate??? It was reading at least +/- 1k!!!

DavePoth · #20 Post by **DavePoth** » Sat Jan 13, 2007 8:41 pm

so it might just have been the pistons slapping against the block and the crank bouncing that was holding it back to "5000"...

Dollyboy · #21 Post by **Dollyboy** » Sat Jan 13, 2007 9:30 pm

...or why not dick around with the mixture again?

could be dirty air filters too, thats if you havent binned them. could be air starvation, in fact a mass of fuel related things, as well as ignition related things. been twisting the dizzy?

you bad boy.

things arent always what they seem...

i recently had a proper trauma with the bike - fitted new clocks from bandit, wiring not directly compatible so even though i have a wiring diagram for the standard bike loom and also traced all the wires into to clocks and muppet lights i still had to use an element of trial and error. also in the process the thing ran out of fuel. the fuel plumbing isnt correct, i.e. the reserve isnt piped up, but the 'on' is, creating an illusion of having plenty of fuel left, when actually its not getting through. proceeded to re-fuel the bitch, then found she still wouldnt fire properly, big flames out the pipe, backfires the lot. bike has 2 coils, one for '1' and '4' and the other for 2 and 3 (obviously). was convinced my tacho wiring or something else was grounding one or both of the coils causing discharge before plug could spark, but eventually after a week of head scratching, few phone calls etc i got sick of it, pulled the air filters off, cleaned some crud out the intake side of the carbs, gave it a few fistfuls and some big startermotor abuse, et voila, she lives again, nowt to do with my wiring, just dirty carbs.

Purplebargeken · #22 Post by **Purplebargeken** » Sat Jan 13, 2007 9:34 pm

Be nice to see some bike piccies

Ken

Dollyboy · #23 Post by **Dollyboy** » Sat Jan 13, 2007 10:06 pm

a bike?

on the dolly board?

surely that'd be like putting a spoon in the knife draw, or in the mrs' case a knife in the screwdriver toolbox, either one would do the same job for her...

she's not that attractive at the minute (the bike that is, the mrs is quite tasty), the back fairing/seat is 'hanging' off by the wiring to the rear lights, theres no headlight and just a load of pretty coloured spaghetti hanging out the front.

imagine a bandit... painted saxo blue... with renthal bars on risers... and a 1off back fairing that looks a bit pointy and slightly jacked up... with twin tailights (1 at the end and 1 underneath)... and a big single chrome headlight... fairly clean and tidy... black engine with polished ally side covers... black undertray...

...and roberts your mothers brother!

for you, Mr Ken, I will endeavour to find a pic before I demolished her and pop it on here shortly.

SprintV8 · #24 Post by **SprintV8** » Sat Jan 13, 2007 10:25 pm

Check the general Thread

Hint.

BUSA Turbo

.

Dollyboy · #25 Post by **Dollyboy** » Sat Jan 13, 2007 10:59 pm

ok, heres the toy:

its a bit of a tossy pic taken with phone, but gives you an idea... looks much better with new clocks.

she's a "slabby" for those in the know, thats an OLD gsxr 750 endurance for those also in the know, circa 1985 (B plate), uk reg'd although originally imported. daytona throttle (not the triumph type), i.e. 1/4 turn from 0-full. when i said the back end is a 1-off, basically its from a home made mould, done in GRP (fibre-glass), not done by me, but theres probably a few duplicates been made from the same mould. the can is a standard one thats been 'chopped' - sounds evil.

engine is air cooled (the rad-type thing up front is actually an oil cooler), straight 4, short stroke, revs merrily to 10k+. mikuni twin carbs (shite), apparently been dyno'd and jetted etc (hmm, dont they all say that!) with k&n filters, hydraulic clutch, braided hoses, blah blah blah.

the tail light where the number plate is fitted is an LED one (e marked), and the one you can just about see right on the back is one I fitted (took a while to find one that would actually fit!), and used a spongey cut out from a dolly front indicator gasket to stop it knackering the paint.

bars (of the renthal variety) are on very tidy aluminium risers from the top yoke. nice bmx style crash pad!

slow compared to vtr, top end maybe 120, short geared for front wheel lifting abuse, pulls very hard through gears to about 4th then starts to run out of puff. cheaper to run and insure than vtr, not really that arsed with bikes over the last yr or so, but this is fun in a different way to vtr, and not quite as dangerous speed-wise, and means i can keep my full no claims while having somthing to plod about on when the mood takes me, hooligan styleee...

Purplebargeken · #26 Post by **Purplebargeken** » Sat Jan 13, 2007 11:21 pm

Looks like a whole lot of fun. Oh how I miss my ZRX1100 with renthals, carbon can and stage 1

Thank you for the piccie

Dollyboy · #27 Post by **Dollyboy** » Sat Jan 13, 2007 11:38 pm

she'll be on the road again tomorrow hopefully.

still a couple of little wiring glitches to sort out. bandit is liquid cooled so muppet lights include a temp warning light. slabby cluster had a side stand light but air cooled so no temp warning... so substituting temp light for stand light. bike wiring is full of common positives as well as negatives, hence my original wiring dilemma.

also on top of that, when you put sidelight on, main headlight comes on too... sounds easy to fix, but actually not that staright forward. light switches on RH handlebar, main/full beam and flasher are on LH handlebar. headlight wiring feeds from fuse box half way along the bike. flasher is not a parallel to main beam, so theres headlight and main beam wiring all over the fookin bike, which has been spliced about and mod'd already by PO's, so all in all a bit messy. im sure my electrical powers will shine through, just a matter of time...

2F45T4U · #28 Post by **2F45T4U** » Sun Jan 14, 2007 2:13 am

I thought all Dolomites Tachos were that dodgy.

I'm sure Lewis said his was when he had a ride in my car some time back.

And Kev who set the carbs, valve and ignition timing up last time it had work done to it? MEEE

Took it to George once the gasket had just been done and he double checked everything, all bang on

Lewis · #29 Post by **Lewis** » Sun Jan 14, 2007 10:55 am

No Adam, I said yours was the first I'd seen that actually did that after hearing all the rumours

In my 1500 the rev counter did occasionally 'sleep' though, a tap or a rev would usually wake it up though

Not my problem anymore though

Lewis · #30 Post by **Lewis** » Sun Jan 14, 2007 2:36 pm

Saw this today too, Spoon built, safe to 11,000RPM engine, great stuff

http://www.youtube.com/watch?v=Rl8T9KFgjWc

Drift king Tsuchiya sounds like he likes it