race engine build up

spike · Post by **spike** » Sat Dec 26, 2009 2:58 pm

i couldnt work out wether this should go in performance or my ride meh if it gets moved it gets moved
took my new engine out today
flywheels off and ready to get the meat ttaking off.
for anyone with an ea82 and has played with it there is a lot more than you think on it. im going to put some pics up soon of the work.
thanks all
and ill keep posting about the race engine

phillatdarwin · Post by **phillatdarwin** » Sat Dec 26, 2009 10:28 pm

hay what are u going to put it in

waterboxer · Post by **waterboxer** » Sun Dec 27, 2009 11:19 am

Will be looking forward to pictures.
On the subject does anyone have the article that floated around on aero forums on how to make the ea81 single port heads into twin ports?
This included machining and welding.

discopotato03 · Post by **discopotato03** » Sun Dec 27, 2009 3:44 pm

The factory flywheel on an EA82T , which I'm guessing is just the 4WD EA82 one , is really heavy . Mine was turned to lighten it and sent back to be milled because it was still too heavy .
If you get yours milled tell them to replace the timing marks otherwise you won't have any . I have a Vortex pointer on the front of my engine so alls not lost .

What you'll notice is that the engine loses revs noticably faster on up changes which is good news for the boxes syncromesh . Also the engine revs up more easily when double declutching down the gears quickly . Basically faster transients due to less revolving mass . There would be an improvement in low gear acceleration because less energy is lost accelerating the mass of the flywheel so more goes into driving the gearbox .

My clutch shuddered just a little when this was first done but it was with a newly rebuilt engine and the clutch is a one off organic sprung special . Also my L RX runs the non turbo pedal box because the turbo ones linkage kept breaking itself , so the pedal ratio is not what it should be and the clutch can be a bit sudden because of it . Just thumps a little if not thinking about it . No shudder when the friction plate bedded itself in .

For throttle response with the std TB , it would be a great shame if the damper gadget mysteriously unscrewed itself and fell out because the return to idle is faster without it . Much nicer for these ancient gearboxes .

A .

little_red_L · Post by **little_red_L** » Sun Dec 27, 2009 4:19 pm

have you put it over a dyno? cos i've heard that lightening the flywheel, though great for revs and response, reduces torque low down. but i guess being a race engine 'low down' won't be a common occasion.

spike · Post by **spike** » Sun Dec 27, 2009 5:54 pm

ok here are the before pics.
originally the flywheel weighed 12.5 kilos wich even on a road car amazed me

spike · Post by **spike** » Sun Dec 27, 2009 5:57 pm

heres the work in progress and yes we did save the timing marks if you can just see them, they may stay they may not. depending on how well it works at the end

spike · Post by **spike** » Sun Dec 27, 2009 6:03 pm

and the final finish.
total weight is now 9.5 so a reduction in 3 kilos now this mayy not sound like much but most of it is from the outside edge, so with the torque foot per pound it saves roughly 30 kilos in first gear at the wheels.

the engine is likely to go into a formula vee chassis and be used for hillclimbing, racing in formula libre and possibly offroading in single seater catagory. if we make the jump to the ej motor then yeah the engine will probably go into the road car

discopotato03 · Post by **discopotato03** » Sun Dec 27, 2009 7:37 pm

I did see mine after it had been milled and it did feel a lot lighter than another std one I have . From memory it was milled in the sections between where the pressure plate bolts down .
On the road it feels real good .

Flywheels don't make power but at speed they store revolving mass . Mostly what they do is even out your cylinders power pulses and stop the engine stalling when you take off at low revs .
In an off roader a std one would be good for walking along in low gear .
MY RX L has an AWD box in it with the low or carby L low range gears so crawling along is no issue . I actually took it off the road briefly a couple of days back , over a hump and into a service trail . Didn't shudder in 1st low when climbing back up a clay shelf so no probs here .

Cheers A .

phillatdarwin · Post by **phillatdarwin** » Mon Dec 28, 2009 11:49 pm

waterboxer wrote:Will be looking forward to pictures.
On the subject does anyone have the article that floated around on aero forums on how to make the ea81 single port heads into twin ports?
This included machining and welding.

I might have something somewhere on a hard drive. I will look some time this week for u when I get time.

spike · Post by **spike** » Tue Dec 29, 2009 3:17 pm

phillatdarwin wrote:I might have something somewhere on a hard drive. I will look some time this week for u when I get time.

would love to see that.
it would stick with my motto of cheap engine especially for this engine. anything that can be done myself will and on the cheap.

phillatdarwin · Post by **phillatdarwin** » Wed Dec 30, 2009 2:16 am

i will have a look soon as i have my computer working agean as it blow up 4 days ago buy lighting

BlackMale · Post by **BlackMale** » Thu Dec 31, 2009 9:02 am

Looks alright i had about 5kg taken out of mine, looks something like this

you'll notice a huge difference.
Good luck with it.