anyone got any idea? ie from failures?

want to run alot of nitrous on the n/a zetec lump ive got in my fiesta and think the rods are going to be the limiting factor.

 

usual max quoted is 270bhp

and prolly about 300 lbft

 

Anyone ever had one fail under compression at all?

Nitrous exerts LESS force on the rods in terms of stretch than without nitrous, so if its just revs that kill them he is laughing as he wont be revving any higher.

 

rev to 6800 with std bolts or 7200 with rod bolts

i have not had any first hand evidence of a rod letting go, so i guess there is only one way to find out stu!

 

i heard it was 7200 with std bolts, anything over that needed arps? either way i wont be revving it much past the 6800 mark anyway.

there is only one way to find out if nobody knows isnt there

 

i remember severn valley had a 300+ bhp zvh on standard rods,

but why take the chance, prevention is better than cure my granny used to say

 

but running std rods is better than buying steel ones if i dont need them!

if it does the rods what have i lost? potentially 50 quids worth of zetec block and a load of time off the road. not the end of the world.

if its a certainty that it wont do 300bhp/300lb/ft then i will change em but id imagine a 300bhp zvh is making WELL over 300lb/ft of torque....

 

Standard rods have gone past 300bhp before, non shot peened i beleive too.

Generally 300 is ok from what i understand.

'Turboboss' from here had a dynod 330bhp on his old engine with standard rods.

 

i should be fine then! sweet hoping to run 150bhp of gas through it when i can get it on some proper management so should be around the 330mark hopefully!

 

My mate's rods let go at 9k rpms with ARP's, the bolts held in place but the rod itself snapped and the oil pump gave up at 8k

This is what happened

 

yeah oil pumps are renowned for dying at 8k+. im on std cams for the minute, may go for some fast road jobbies at some point, but still wont be revving it much past 7k. no interest in revvy peaky engines, id sooner have the torque and drivability!

 

As johnny says, we did a kompressor black top mondeo engine with 465bhp and over 500nm on a totally std bottomend.
The oilpump keept on going as we reved it over 8000rpm but the rods were fine, no problem.
I´d say 350-400bhp max and not over 7800rpm
After that we wanted to turbo it, but dident finish the project

Here is the manifold we were gonna use

 

wow!! that sounds promising then! i was worried about putting 150bhp through it as thought the rods might be shitting it by then but thats awesome news!

 

Anymore pics?!?!?!

 

cossiemanden
465bhp on a standard bottom end??? am i reading that wrong

 

Thats a blacktop tho, they are bettewr than the silvertops!

a silver top WONT do 450bhp and 7800 rpm on a std bottom end, well, not without the fucking big bang anyway

 

surely a stndrd blacktop bottom end wouldnt handle that power tho???

cossiemanden
please come back with more details & pics

 

No your not
I haven`t got that many pics, but it was with a std bottom end portet black top, custom cams, focus-central racing 4-1 manifold, biggest ever ROTREX compressor, rover inlet, haltech management.
All this was in a totally stripped mondeo mk2 with vintertyres, and KW suspension, funny car
Will try to find some more pics anywhere