Displacement: 1,997 cc (121.9 cu in) Compression: 11.7:1 Bore: 87 mm Stroke: 84 mm Rod Length: 153 mm Rod/stroke ratio: 1.82 Power: JDM 250 PS (183.88 kW) @ 8,300rpm & 22.2kgm (217.71 Nm) @ 7,500 rpm
Right, he's got 250PS, which is near enough 250bhp without reaching for the calcuator. Assuming it's the usual V-tec, you are not going to beat him with this spec, period. Decide whether you want to just take part and chase him for now, or re-deploy your budget into a 1.8T motor and keep within budget.
No its not. Keep in mind they have 10 or 12 cylinders. This adds up to so many hp because of this, and all the work that they are doing at 19000rpm. You have 4 cylinders, big difference. They can afford to run small throws meaning lesser torque per cylinder, add them all up and you have a respectable torque/hp figure at 19000 Id also like to correct my brain fart mix up of codes too in my quote below, ''The longer rod also means that the piston passes over tdc slower than with the shorter 144 rod, it gives the port a better chance to breath from say tdc-10degrees. Which iirc is where the abf gets some of its extra low down torque from.'' It should read kr, and not abf.
Longer rods mean longer piston dwell at TDC, keeping the combustion chamber small for a longer period as the expanding gases push against the piston. This places the force of the expanding gas onto the crank for a longer duration of time, than it would normally see with a shorter rod. I was comparing the abf to the kr, on re-reading I notice its the 9a your talking about too so sorry about that To be-honest Id use either or, and wouldn't lose too much sleep over the longer rods(159mm). Longer rods do put less stress on the bores though. But if you really are serious about going after 250hp then go with the 144 rods, you wont want the piston staying near tdc for any period of time at all at all, it being there longer results in a greater risk of detonation taking place due to the very high cr you will have to run to see those figures.Along with a load of other stuff.
You can beat a type-r easily with a kr producing 200bhp.They have no torque.. As for a 84mm kr...thats very difficult
For a bit of light relaxation, I thought I would look at the relationship between long and short rods, in an otherwise identical engine. I have not worried myself about friction losses or inertias, etc. Just what is happening in and ideal situation at the instant the crank hits 45 deg: ERRATUM: Time at top of stroke is longer for the 159mm Rod. As Brian G states.
ABF higher torque which is probably why they have larger Main Caps . Had my mates 9A in bits the other night and noticed how much smaller gauge the main caps are.
Great comparison, this is. Just to stick it all in one place: Code: [B]Engine Bore Stroke Rod length Deck height* Characteristics[/B] 9A 82.5 92.8 144mm 220mm More power ABF 82.5 92.8 159mm 236mm More torque Type-R 87 84 [COLOR="Blue"]153[/COLOR]mm ?mm No torque! * Crank centre line to deck So the Type-R is a short stroke screamer. Volume under the Honda vs VW graphs might be useful, and also an idea of the type of courses you are racing on. brutalmk2-16v: why is an 84mm KR difficult? Pistons have to be found, but the bores should just take it.
Deck height for F20 and F22 blocks is: 223.9mm Because a kr's bores can't take it at 84mm.1st thing is that you have to remove oil injectors which is not suggested at very high compression in an all motor engine and 2nd i have already cracked 2 kr blocks at 82.5mm.The cylinder bores just crack and after that you can drink water from your block [:^(] Pistons are not difficult to be found.The block is the problem.It's not safe at all.I had my first block cracked in the first 24 hours and i wasn't even racing..
Great, updated: Code: [B]Engine Bore Stroke Rod length Deck height* Characteristics[/B] 9A 82.5 92.8 144mm 220mm More power ABF 82.5 92.8 159mm 236mm More torque Type-R 87 84.4 [COLOR="Blue"]153[/COLOR]mm 223.9mm No torque! * Crank centre line to deck This is interesting, but begs the question as to what VW Motorsport and Seat Sport were doing with the Golf and Ibiza kitcars, both at 84mm. If you are cracking blocks at 82.5mm, something must be wrong somewhere, and it is not the bore size.
