53 replies to this topic

[JimmyJamJerusalem]

ive got the rods already. i was looking for 255/260ish BHP. obviously if CMS can map it higher then that it would be great.

i have the 2.5 full tullett, so it wont go past 270 BHP anyway, i dont think i will get anywhere near that though... so im guessing i should be safe?

but what i wasnt sure on is, do i have to do anything if i wanted to run the smaller pulley? (i think its a 2.9) or should i just swap it out for the standard one to be safe?

Dude, I'm on Standard Pistons, Eagle Rods and small pulley. That with Light fly, balancer delete, and 3" Decat Tullet I pulled 265bhp. I went for the Saab head gasket when putting it all back together.

[Exmantaa]

Depends on your pulley size, but that sounds a bit low for those mods. Not?

[The Batman]

Don't fit the 2.9" Or 3" pulley as it will be too much boost and more than likely say bye bye to a piston fit standard and be safe trust me engine swaps/rebuilds are expensive!

[techieboy]

Too true.

[Exmantaa]

Was a German guy not running/racing with 290+ BHP on the standard pistons for over 2 years? (Hitec SC conversion) @Joe, did you experience a boken piston with a smaller pulley?

[Kieran B]

Don't fit the 2.9" Or 3" pulley as it will be too much boost and more than likely say bye bye to a piston fit standard and be safe trust me engine swaps/rebuilds are expensive!

@Joe, what about fitting the Saab head gasket like Jimmy? my set up seems identical to his minus the 3" tullett (mine is 2.5")

[Bargi]

Kieran's got a 2.5 exhaust which will limit to about 260/270 maybe? There's approx 30BHP for the SC so at the motor it's 290/300 and that's close to the standard pistons limit. So 250/260 is maybe the tops he'd want to go with the setup and that's doable with the std pulley and tried and tested? To go higher he'd need to get a 3inch exhaust, pistons and then 300ish you're looking at springs and all sorts of other things? I'll be doing rods and low-compression pistons. Although I'll still be running a Milltek setup the idea is to get about 250 now and get all the major clam off motor out work done now and at a later date upgrade the exhaust, cams, springs, etc. So sensible thing thing seems to be to swap pulleys? (if my maths above is kosher ) If we do swap is a turbo head gasket still a good idea for both of us to do? Techie, when you say it's noisier is that just when you're on it or is it even when you're taking it easy?

Edited by Bargi, 08 March 2011 - 11:36 AM.

[techieboy]

Techie, when you say it's noisier is that just when you're on it or is it even when you're taking it easy?

Only when you're on it but, that "on it" happens earlier than it does on the standard size pulley. I like the SC noise and it doesn't really bother me any more than the just generally too loud car that it is anyway. Exhaust noise is much wore wearing, in general use, than the noise of the SC.

[The Batman]

Kieran where jimmy says he is running a smaller pulley, im not sure if it actually is... As he gained no more power I imagine it is the standard size but just one that comes with a hub for ease of changing pullies Exmantaa not sure as my rod was snapped and my piston come out in little stones! Both completely smashed to pieces! Oh and let's not forget my bent valves, cracked head, hole in the block and in the sump Bad times

Edited by joe_589, 08 March 2011 - 01:01 PM.

[Exmantaa]

Rods simply snap due to overload (torque + rpm's) and kill your block intantly. Pistons should hold a while, but the hypereutectic OEM's are a bit brittle so they really don't like too high temps or detonation...

[Bargi]

Techie, when you say it's noisier is that just when you're on it or is it even when you're taking it easy?

Only when you're on it but, that "on it" happens earlier than it does on the standard size pulley. I like the SC noise and it doesn't really bother me any more than the just generally too loud car that it is anyway. Exhaust noise is much wore wearing, in general use, than the noise of the SC.

should be fine then

[Kieran B]

Looks like we are going to be doing a trade then Bargi! Would have wanted the smaller pulley, but not at the cost of the engine going BANG thanks for the input guys!

[Mike (Cliffie)]

Standard Pulley, standard rods, standard head, Piper cams and a good charge cooler= 262 BHP out of my canoe.

[14500rpm]

Standard Pulley, standard rods, standard head, Piper cams and a good charge cooler= 262 BHP out of my canoe.

Did you use a B207 head gasket?

[The Batman]

No need to change head gasket however if it is off then the saab is better

[Bargi]

Standard Pulley, standard rods, standard head, Piper cams and a good charge cooler= 262 BHP out of my canoe.

so why bother with the Eagle Rods, Wiesco Pistons and the spare engine rebuild?

[JG]

I'm planning std everything, but a pretty std rev limit

[Kieran B]

I think its safe to say im even more confused then when i first started this thread. it seems every ones got a different opinion.. the Saab head seems to lower the compression, right? which is a good idea, as its less stress on the internals.. so ill snap one of them up.. as for using the smaller pulley, no one seems to know for sure what the outcome will be with the original pistons so rather then be the guinea pig, it makes sense to just use the standard pulley..

Edited by Kieran B, 08 March 2011 - 07:32 PM.

[techieboy]

Fitting the smaller pulley instantly gave me 20bhp+ more than the standard sized pulley. If you're already getting circa 260bhp out of the standard Stage 2, it'll put you right in the danger zone.

[14500rpm]

I think whilst the engine is in bits you might as well get some new pistons in there too. I was going to go with rods only but as my engines approaching 100k now a rebore and some wisecos seems a better bet. I don't really want to pull the thing apart again, especially if its to fish broken bits of aluminum out of the sump