hot starting

[mbm5]

Does anyone else have problems turning over their standard 1340 after a long run! Car starts fine after it all cools down.
Engine has been on running in oil (not sure if that is related) and is running 12v.....
Thanks..

[splitpin]

Unlikely, but worth checking the condition and proximity of your throttle cable.

On the latter, that it's not 'pinched' (forced out of it's natural arc) anywhere and that it's properly supported and shroud-wrapped wherever it's close to the engine/exhaust.

Likewise of course your fuel lines, heat soak/vapour lock to the same being the usual suspect on an FI engine.

Edited by splitpin on Saturday 28th May 12:02

[mbm5]

Thanks for the reply. The issue is the engine not turning over at all when hot. When it cools down it has no problem.
suppose it could it be the battery but its funny that it only is an issue after a long run...and recovers when the car cools...all temps and pressures are normal.....its a new engine and is making plenty power...

[splitpin]

Apologies, didn't read it that way ........... read it as struggling/reluctant to fire.

What nothing at all? What's clicking etc/what's not?

Sounds like either the battery or more likely the starter motor and/or the wiring between, heat soak from somewhere being the factor.

[mbm5]

The starter turns half a rev and gives up. Maybe hot starter motor....??

[gaxor]

Its a known problem with 12V SR3's. Makes a huge difference if you crack the throttle open about 20%, it kills the compression and allows the engine to turn over way faster. Was explained to me by one of RPE's engine guru's!

[dsl2]

Pretty usual in my experience Mart, I found that turning the master switch off & on again seemed to help it fire.

[Simon T]

24 volt starting is the fix for this

[LCM]

Simon T said:

24 volt starting is the fix for this

Seconded!

It's quite easy to install (IIRC RPE have a simple wiring diag. If they don't, PM me and I'll send you one).

Go 24v and don't look back (just remember to charge the 2nd battery every few weeks as it isn't charged from the alternator).

[mbm5]

Thanks to everyone for the feedback. Will go for an external aux battery and see how that works out. Don't want to lug around the 2nd battery...

Cheers
Martin

[BertBert]

LCM said:

Go 24v and don't look back (just remember to charge the 2nd battery every few weeks as it isn't charged from the alternator).

Mine is on the SR3.
BErt

[LCM]

BertBert said:

Mine is on the SR3.
BErt

That's pretty de-luxe!

What are the BigR coming to?

It'll be iPod* docks next...................

note *other MP3 players are available

[splitpin]

For some unknown reason, I had in my head that the SR3 RS sidepod auxillary battery (for 24V starting) was simply 'slave/robber charged' off the main battery engine side of the firewall, so not directly supplied off the alternator.

Oh well, you live and learn.

[BertBert]

I could be wrong (has been known), but I think it's all done by the 24v charging ecu!
Bert

[DarcySmith]

Hi Martin,

Great to see you back racing again mate

Having owned a few Radicals!Hot starting:

1300 12V starting fine

1400 12V starting ok

1440 tuned 12v starting-just about

Latest 1440 tuned(K8)24V amazing

Trouble is,I think the 24v system , is an expensive add on from Radical.

Cheers

Darcy

[LCM]

DarcySmith said:

Hi Martin,
Trouble is,I think the 24v system , is an expensive add on from Radical.
Darcy

Why?

There's nothing to it.

A "Green Label" starter (which you should have on any resonably recent 'Busa anyway), a small 2nd battery, a metre or so of cable and some connectors, some aly strip, bit of thin sticky backed foam and a few nuts and bolts to tie the battery down, an hour of your time and happiness!

[DarcySmith]

I think the Radical system has its own ecu to give greater charge control


Regards

Darcy

[double d racing]

Maybe a red herring ..but cables lose their conductivity the hotter they get so worth making sure they are as far away from heat as poss..

[splitpin]

Concur (as deployed in filament bulbs) hence same observation earlier.

[LCM]

DarcySmith said:

I think the Radical system has its own ecu to give greater charge control


Regards

Darcy

Surely the anarcho-journalist, Upton Sinclair was not referring to anyone we know in the eastern reaches of this fair and pleasant land when he said "It is difficult to get a man to understand something when his salary depends on him not understanding it". :

Sounds like turning a simple solution to a simple problem into something of complexity and extravagance to me...............