| Forums | Register | Polls | Search | Statistics | File Bank | 
 (?)  
You must be logged in to post content on this forum.
Spannering 7-DNA Forums / Spannering /  
 

Electrics - Should be quick for a knowledgeable enthusiast!

 
Author Rampmonkey
Planning a blat
#1 | Posted: 20 Apr 2014 18:45 
Good evening all!

Been a long time since I've posted anything here! (Been along time since I had the 7 on the road!)

Got an electrical issue that I think has a quick solution but I want to double check as I'm a self confessed electrics biff....

I've had ongoing alternator issues with the Seven for a couple of years now, ever since the Valeo gave up the ghost in 2011 (bearing failure). Bought in a replacement from Redline but I've had ongoing issues with blown regulators.

See this link here for the full sorry issue....http://www.blatchat.com/t.asp?id=231023

I've a 2000 reg 7 with a 1994 stock 1.8 Vauxhall SOHC that gives max power circa 6250RPM - I'm starting to think that the RPM might be overloading the 'new' alternator's regulator as a by-product of the drive wheel radius creating a gearing effect and running the alternator at an RPM that it doesn't like.

Question is - does this sound likely? and if so, what radius alternator drive wheel or type of alternator do I want to be looking out for?

This is getting REALLY frustrating. I had no issues with the original set up and took it as gospel that the lads at Redline knew the best kit to send me.

HELP! It's sat there just doing NOTHING and I want to DRIVE IT!!!!!!

Author Eugene

Heading South
Male
#2 | Posted: 20 Apr 2014 18:58 
That does sound very likely!
And I'm sure Raceline (not Redline) said something similar recently regarding a similar problem with Zetec conversions with high max revs.???

Not sure what size pulley wheel you'll need, but anything larger than what you have should help, and prove the issue one way or the other.

Eugene
Le Presidente

Author Rampmonkey
Planning a blat
#3 | Posted: 20 Apr 2014 19:09 
Cheers Eugene.

There's a pretty decent auto electrical workshop in Aylesbury - I'll pop over an see what they've got!

Desperate to get on the road again! Been massively busy the last few months and not even had 5 mins to think about the car!

Cheers!

Jase

Author Eugene

Heading South
Male
#4 | Posted: 20 Apr 2014 19:12 
Got my fingers crossed for you!

Eugene
Le Presidente

Author Rampmonkey
Planning a blat
#5 | Posted: 25 Apr 2014 09:37 
Following on -

Just spent a very productive hour with a top notch bunch of auto electricians in aylesbury. They bench tested the alternator and concluded that the rotors had been thrown due to the thing being run at excessive RPM. Oh dear. I really need to look at longer term solutions methinks!

Has anyone ever fit a smaller japanese produced alternator to a vauxhall engined kit? I appreciate this would involve modification of mount points/ brackets etc.
Can anyone recommend any decent alternative alternator to the rather hefty Lucas FRA252 that I'm currently lugging around?

The electrical loading on my Seven is miniscule - No wipers, no heater, no blowers. Nowt but lights and spark plugs!

Ta!

Jase

Author Eugene

Heading South
Male
#6 | Posted: 25 Apr 2014 10:15 
Sounds like a question for Uncle Albert... I'll point him at this thread!

Eugene
Le Presidente

Author Caterham Zetec
Driving through town
#7 | Posted: 26 Apr 2014 09:17 
After approx 18 years of Caterham driving with very little in the way of alternator issues on both my X-Flow (8600 rpm limit) and Zetec cars back in 2008 things stated to go badly wrong. The alternator became noisy so tried to buy another. The local factors had plenty of RH 35 amp ones but no LH 45 amp ones. Eventually located one which was OK for 6 months and then it stopped charging. Trouble was the factors had gone bust so no warranty. Took it to a local auto electrical place who took it apart and wondered how they got away calling them reconditioned. They replaced the box at the back that does clever things and all was OK (ish). Like all Lucas alternators it never charged at the 14.4 volts of modern alternators, best the voltmeter would claim was 13.7 volts.

So after a couple of years when the bearings started to grumble I decided to fit one of the modern small Japanese ones.

Found a local Kit Car maker who did a complete kit for the Zetec that included all parts to fit and at an all in price of £220 quite a bargain, 1/2 the Dunnell price. Fitted easily enough but after 20 miles it started making bad noises and the volts were all over the place. Took it back and they exchanged it and guess what, after about 30 miles all sorts of noises and volts all over the place. Took it back and they blamed me for fitting it incorrectly and refused to change it again. Simply told them I would contact Barclaycard and get a refund from them, they changed their minds and gave me a refund.

Later that day had 4 tyres fitted by the friendly mobile chap who lives up the street. Chatted about the alternator and when I mentioned the Daihatsu alternator he said he had one in the garage off his old Charade GTTi, I could have it FOC. It was an ugly, dirty old thing but for free worth a go. Swapped my muti Vee pulloy over, made a simple adapter for the fitting bolt and a bracket to stabilise the front of the alternator, bought a belt, connected it and started the engine. 14.4 volts (drops to 14.2 when hot), no noises and no worries about the cooling fan chopping a brake pipe.

After a few weeks with no apparent issues decided to try and get a spare but could not cross reference the part number. Spoke to Denso and their chap rang me back and what a helpful chap he was. Basically all the Denso units are similar, the plug on the back is specified by the manufacturer so if its the same physical size with the same mounts its going to be the same unit. Bought one off E-Bay, £14 posted, no idea if it works, never needed it (yet).

Whilst on the phone I mentioned the Denso alternators I had bought previously and how they had failed after a few miles. He asked me a simple question, what did it say on the label. Told him "Nippon Denso _____" (had kept a note of the part numbers), same label as the Daihatsu one but without reference to Daihatsu. He told me that they had stopped using the word "Nippon" back in the 90's when they started supplying more European parts and the only new "Nippon Denso" alternators available are cheap Chinese ones made from cheese. Either my local "friendly" Kit Car manufacturer is unaware or is simply selling fakes as the real thing.

So buy a Denso Alternator from your local scrappy. Make a bracket and you should be OK. Very happy I changed.

Author Rampmonkey
Planning a blat
#8 | Posted: 28 Apr 2014 19:56 
Caterham Zetec

Cheers for the reply Zetec!

The bloke down at the Auto electrics unit said exactly the same thing - Get a used Denso! I've had the Lucas re-worked as an interim measure to get sorted for an MOT; I'll get a more permanent solution as soon as I can thereafter!

No denying it, this whole electrical thing has been something of a pain. It really takes the edge of an otherwise great drive when you keep thinking "...was that a flicker of a charge light?" every time you're out and about. Already had one break down call out as a result; annoyingly, just out of walking distance of the nearest pub.

I'll be back on the roads of Buckinghamshire by saturday!

Jase

Author chelspeed
Planning a blat
#9 | Posted: 4 May 2014 11:18 
Rampmonkey:
Has anyone ever fit a smaller japanese produced alternator to a vauxhall engined kit? I appreciate this would involve modification of mount points/ brackets etc.

SBD do kits to fit small alternators to Vauxhalls. SBD

I've had one for years without problems. Mine's mounted on the exhaust side attached to a modified Caterham engine mount as the inlet side shown in the picture is occupied by water hoses and oil coolers.

Author Caterham Zetec
Driving through town
#10 | Posted: 6 May 2014 10:46 
Rampmonkey:
SBD do kits to fit small alternators to Vauxhalls. SBD

They may sell them but have you seen the price. £210 for the alternator and another £108 for the mounting kit. probably extra for the pulley and belt. The small Denso alternators from scrappies are exactly the same and modifying your mount to suit is hardly rocket science.

You must be logged in to post content on this forum.
Spannering 7-DNA Forums / Spannering /
 Electrics - Should be quick for a knowledgeable enthusiast!

 

 
Online now: Guests - 1
Members - 0
Max. ever online: 198 [11 Jan 2023 09:48]
Guests - 198 / Members - 0