High comp cranking current draw.

[pingpong]

Chaps, I need to spec electrical components to suit the cranking current draw for a high comp engine - does anyone happen to know what would suit? My suspicion would be between 75 & 100 Amps.

Many thanks!

 

[pingpong]

Any help?

Out of interest what is a stock engines starter current draw?

 

[SkidMarx]

Il check this for you in a moment, going out to jump start one might aswell bang the amp clamp on it while im there.

 

[SkidMarx]

Ok so cold night, not been started for a few weeks. Coil pack disconnected and cranked for 5 seconds, highest registered ampage 146A

 

[pingpong]

Thanking you kindly

 

[SkidMarx]

No problem Unfortunately have no idea how much more amps high comp would draw.

 

[pingpong]

That's no problem, you've given me a starting point which I what I needed!

 

[mark123]

That's worrying I only have my race car fused to 150A.

 

[pingpong]

Mark, you need to check your wire rating in that case - you should have 30% extra capacity in the wire beyond required, with the fuse having 10-20% (ensure the fuse always burns out prior to the wiring!)

(Maybe you already know this?)

 

[mark123]

The wire I used was at least as high a rating as what was in the car originally.

 

[SkidMarx]

That's worrying I only have my race car fused to 150A.

Also dont forget a 150A fuse doesnt blow as soon as it see's 151A. Probably be a few seconds at 170A+ before it pops.

So probably no need to worry, If it hasnt blown it yet then its probably fine.

 

[NorthloopCup]

No problem Unfortunately have no idea how much more amps high comp would draw.

Not much more than a normal 1*2 tbh as the dynamic compression ratio takes over once the engines turning.