Here I am talking about cams, but haven't factored in the idea that the rev limit will probably need an increase to 7,500 with the Schrick 268/276 (or similar). I'm guessing this will be the limit of the rods/pistons... and are the ARP rod bolts essential at these revs with the ABF? If one of the cam'd 16v owners here (barney, Matt D etc etc) could help, that'd be great! Cheers
I ran Racetech fasteners in mine. Rod bolts and head studs for peace of mind. Rev limit I ran was 7800rpm. 2ltr (9a block) over bored to 2008cc Stock rods are Ok.. Consider doweling the flywheel on tho. Higher rpm's than that would call ideally for solid lifters. hyrdo's can froth up with sustained high rpms on track. (tick tick tick, when you return to the paddock - LOL) regards bill PS. No reply from the other Auz guy.. His email addy has changed I suspect. (worked as a contractor so probably has moved on)
I'd concur with Bill I'm running ARP fastners/head bolts balanced crank/rods etc Limiter set to 7800 and it has 268/276 Schricks Nice and smooth and spins up turbine smooth too Took lots of abuse last weekend at Mallory like every trackday I do. Make sure to put a baffled sump/windage plate on to help stop oil surge. 9a's if looked after should be bullet proof and last for along time. I run silver Synta in mine religously and it's changed every 5-6K. Ian
What is considered high rpm's on a 1.8 8v such as mine? With the new cam it is a lot more willing to rev, but what should I be limiting at to prevent bottom end damage? Cheers
I was thinking of getting some stonger bolts for mine. I'm not planning on raising the rev limit but would have them for peace of mind now i'm doing a lot of track days whether of not i need them.
I stick to 6500 on mine. Depends on what ure making maximum power at??? No point revving out to 7K if maximum is at 5800... The power will tail off more sharply with an 8v too..
as a general rule..... (note general) if you are using std rev limit you *should* be ok with std bottom end. however if you are running boost, or sustained revs at the top end you should consider the age of the bottom end. Also if you are doing track days you need to consider windage plates and a baffled sump to prevent oil starvation.
ok here goes .... i have the baffled sump + windage plate i do lots of trackdays i have normal, semi and (soon) slick tyres the revs are dictated by the length of the straight bits in between the rounded ones!
I keep telling ya B, you really do need them in yours, especially with the raised rev limiter that you have
It currently make peak power at 6042rpm, but still holds onto power up to 6500rpm. This is where I usually change up if I am caning it. Although, this is 250rpm past the redline. I've not actually hit the rev limiter on mine, but I believe it is about 6700rpm. Cheers
Seem to remember mad20v saying the 16v rod bolts are only safe up to 7000rpm, the rods (with decent bolts) 7500 and over that you need steel rods,ideally [:^(]
Thanks for the reply... Ok. looks like I need at least decent rod bolts - I'm going to need at least a 7,400 limiter, am I not? I don't do heaps of trackdays - once a month max. The car will mainly potter around town and gets wound right out probably 2-3 times a week... So it's not a max-revver everyday - still want to play it safe, though No worries - I really appreciate you trying anyway - seeing I'm not a Jenvey T/b customer - wish I was actually...been having trouble with airleaks with my t/b's - only a month old too [:^(]
Also, still on the ABF mill... anyone know if there are bottom end differences between the ABF and the 9a? Some unreliable source told me the ABF has forged pistons?!?! I'll be pulling the motor out to put in a Mk1 within 2 years at the most, so will rebuild it totally then. I'm guessing it should last fine for the time being, seeing I change the oil every 5,000km/3100mls and it's not a track day special, just something handy for destroying the Aussie Holden "Commondoor/Commonwhore" (commodore) and Ford "Flaking" (falcon) at any given opportunity. Plenty of Honduh!s in my neck of the woods too - they don't seem to undertstand that unless they're in the right gear all the time, their 12,000rpm B18CR making 300BHP doesn't stand a chance against a nice torque laden valver!!
I know from experience, keep revving a standard 16v to 7000 on a regular basis, esp if it's done a few miles and you'll more than likely kill the bottom end.
