Board logo

Head skim, ARP bolts
focijohn - 24/11/08 at 09:21 PM

How much should i get the local engineering company to skim my standard 2.0 zetec (silvertop) by, that im re-building. 1 mm seems to be a common number!?

As for the bolts what should i be looking to pay for the big end bolts, ive looked on burton as the "high" price mark and they came in at £50, or am i just being tight?

Cheers

John

[Edited on 24/11/08 by focijohn]

blakep82 - 24/11/08 at 09:30 PM

ARP con rod bolts for my vauxhall engine tend to be about £70

mediabloke - 24/11/08 at 10:18 PM

Raises an interesting debate. I don't consider myself an expert, but I'm not sure whether it's worth stumping up for ARPs unless you plan to raise the redline or fit uprated conrods. A no-brainer in a bike engine (would you want them letting go at 12-14000 rpm?), but with an oem redline?

I laboured over it for ages, as ARPs for my vauxhall were about the same as blakep82's, but the oems were less than a tenner a set.

What are your plans?

Edit: And you did mean .001mm, didn't you? 1mm seems rather a lot...

[Edited on 24/11/08 by mediabloke]

zetec - 24/11/08 at 11:04 PM

If you are going to be going for more than 7300 rpm on a regular basis I would say go for ARP (make sure they dont bind up and give false torque reading when fitting). I have my hard cut off set at 7200 as there is little point in reving past this. I've got standard bolts and have has no issues. The bolts will stretch due to high RPM rather than high power.

Mal - 25/11/08 at 06:35 AM

Since you are in Malvern I would recommend:
Don Loughlin Engineering
Unit 28, Hartlebury Trading Estate, Hartlebury, Kidderminster, Worcestershire DY10 4JB
Tel: 01299 250636
Don is an experienced engine builder. He has a large milling machine used just for head and block faces. The cutter diameter is big enough to machine the width of a head in one pass. He will probably know how much to take off.
Also his charges are reasonable.

Mal

MikeRJ - 25/11/08 at 11:49 AM

quote:
Originally posted by mediabloke
Raises an interesting debate. I don't consider myself an expert, but I'm not sure whether it's worth stumping up for ARPs unless you plan to raise the redline or fit uprated conrods. A no-brainer in a bike engine (would you want them letting go at 12-14000 rpm?), but with an oem redline?


In the case of the C20XE, the rod bolts are a known weakness. Even if the rev limit is the same, if you are likely to be spending more time at higher RPM (and Locost/Seven gearing is usually pretty low), then you will be exposing the bolts to more stress.

On other engines it may not be worth doing if something else if the weak link.

focijohn - 25/11/08 at 06:43 PM

quote:


Edit: And you did mean .001mm, didn't you? 1mm seems rather a lot...

[Edited on 24/11/08 by mediabloke]


nope 1 mm, i also thought it was a lot hense the question. I was going to use Malvern re-bore spring lane, as we use them for work and they havn't let us down let. They're also just down the road from me.


Where abouts on the trading estate is Don Loughlin Engineering, ive been there to proptech a few times for work and always looked out for something that may have been of any use to me....

As for the bolts i have been swaying back and forth as i don't intend to be up near 7000rpm ALL the time but is always nice to know that it safe. The rest of the internals will be standard for now untill i have gotten used to it.



[Edited on 25/11/08 by focijohn]