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 Post subject: Re: V4 1700 build
PostPosted: Tue Dec 30, 2014 11:17 pm 
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Light Pressure Turbo

Joined: Fri Jun 16, 2006 9:26 pm
Posts: 479
sonettV4 wrote:
Great thread.

Noticed a weep of oil (or is it just anti-corrosion proofing!)

I fitted a set of these and no leeks for the rocker covers

http://www.ebay.co.uk/itm/Cologne-V6-St ... 460b54abcf

(i'm not linked with the seller in anyway)


Thanks for the link, I've known about these for a while but never got around to sorting any out, I'll do it now.

Can't believe that pic was taken over 2 years ago now!
I think the valve covers had just been off to tighten the heads and check the valve clearances so thats my excuse for the oil drip!

Quite timely that this thread has recently come back as the owner had the car on a rolling road today.
Made 100 BHP at 5100 rpm after a few tweaks and was still climbing. I think 5000 is enough on std rods and end bolts though :roll:

Seems reasonable given it's on the Solex carb and the only real port work was to blend in the larger valve seats. Standard 1500 distributor advance curve as well.

Be good to develop it a bit more but he seems happy with it as it is. He's into an early e-type restoration at the moment amongst other projects so I can sort of understand!

Since doing this engine I've now got my own Sonett III so when time and funds allow I hope to do something similar for this.
Already changed the Holley carb that was on it for a Weber DGV which has worked out really well.
Although the engine seems to be in great condition I suspect it's still only 8:1 compresion so really need to get this up a bit.
Just hope it is a 1700 and not been replaced with a 1500! Seems to pull like a 1700 but guess I won't know for sure unless I strip it.


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 Post subject: Re: V4 1700 build
PostPosted: Wed Dec 31, 2014 3:20 pm 
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Put a SOC in it!
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Joined: Mon Feb 07, 2005 4:48 pm
Posts: 21617
Location: Fliptop Towers, North Yorks...the flat bit.
Car Model: One or two...
Should rev to 6000 easily on the stock bottom end. Our old 1500 "rally" car (SAH cam, light skim to heads, steel timing gears, S&R spec flywheel, HP oil pump and twin choke downdraught) would happily rev to 6300, in any gear...comp ratio will make a difference though.

Nice smooth torque curve on that plot though.

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 Post subject: Re: V4 1700 build
PostPosted: Wed Dec 31, 2014 7:49 pm 
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Joined: Sun Jul 29, 2007 9:32 pm
Posts: 1135
Location: Bath/ Dublin
Car Model: 8V-V4
Is there any advantage to be expected of bigger valves if you never exceed 5000-5500 rpm?

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 Post subject: Re: V4 1700 build
PostPosted: Thu Jan 01, 2015 10:53 am 
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Light Pressure Turbo

Joined: Fri Jun 16, 2006 9:26 pm
Posts: 479
Happy new year everyone

melle wrote:
Is there any advantage to be expected of bigger valves if you never exceed 5000-5500 rpm?


You may be right melle, I don't know at what point the bigger valves start to become an advantage.
The old valves had to be replaced anyway, the bigger valves were available 'off the shelf' at a good price and are suitable for unleaded. The purpose of the rolling road visit was not to get an all out power figure but to check fueling and ignition. This was always the intention once it had done a few miles. As it was we did pick up 8 or 9 BHP with some jet changes and ignition tweeks. There didn't seem much to be gained by pushing it that last 1000 rpm. It's not a case that it will "never exceed 5000-5500", I feel that it is one thing touching the red line momentarliy going up through the gears and another holding max revs flat out in top gear. Probably it would have been fine but didn't seem worth the risk just to claim another few BHP. Jetex sounds good flat out at 5000 though :wink:

I have seen a 1700 crank break clean in two, so, yes, I am a bit nervous about them! The higher piston speed of the 1700 is always going to mean the 1700 is a little more fragile than the 1500.


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 Post subject: Re: V4 1700 build
PostPosted: Sun Feb 11, 2018 3:52 pm 
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Joined: Sun Jan 15, 2012 4:24 pm
Posts: 2775
Location: Dunfermline
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Came across this whilst looking for 1700 crank part number.. if anyone knows what it is...
Nice read, great build, great info.. pity some of the pics have been lost..
Is it still going strong, any updates..
Fancy building a 1700, is it worth the expense over the 1500...

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 Post subject: Re: V4 1700 build
PostPosted: Sun Feb 11, 2018 9:29 pm 
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Location: Bath/ Dublin
Car Model: 8V-V4
Car 55 wrote:
Came across this whilst looking for 1700 crank part number.. if anyone knows what it is...
8848269

Car 55 wrote:
Fancy building a 1700, is it worth the expense over the 1500...
Entirely depends on what you're after and what you plan on doing to the rest of the engine... A 1700 in an otherwise unmodified engine makes better low rpm torque than a 1500, but if you prefer something revvy I would stick with the 1500 crank. Building a 1700 will not be more (or less) exiting than building a 1500.

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 Post subject: Re: V4 1700 build
PostPosted: Mon Feb 12, 2018 7:48 am 
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Thanks melle

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 Post subject: Re: V4 1700 build
PostPosted: Tue Feb 13, 2018 1:04 pm 
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Put a SOC in it!
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Joined: Mon Feb 07, 2005 4:48 pm
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Location: Fliptop Towers, North Yorks...the flat bit.
Car Model: One or two...
V4s are inherently grunty, and the 1700 (with HC pistons rather than the LC Sonett set-up) is even more so, even a relatively standard engine - we fitted a HC 1.7 from a Taunus 17M with the 32TDID Solex and a home-bodged exhaust to our old 95 and it was really quick...6000rpm in any gear.

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 Post subject: Re: V4 1700 build
PostPosted: Tue Feb 13, 2018 1:12 pm 
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Joined: Sun Jul 29, 2007 9:32 pm
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Location: Bath/ Dublin
Car Model: 8V-V4
Yes, forgot to say, I was comparing 1.7HC with 1.5HC.

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 Post subject: Re: V4 1700 build
PostPosted: Tue Feb 13, 2018 7:16 pm 
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Location: Dunfermline
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So what can be done to improve a 1500 engine then...

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 Post subject: Re: V4 1700 build
PostPosted: Tue Feb 13, 2018 7:29 pm 
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Joined: Sun Jul 29, 2007 9:32 pm
Posts: 1135
Location: Bath/ Dublin
Car Model: 8V-V4
A twin choke carb, hall ignition, some light porting, and a better exhaust make all the difference; there are many threads on this on here and the V4 forum. To be fair: a proper tune up already improves many V4s, they are often running way too rich and have poorly adjusted ignition.

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 Post subject: Re: V4 1700 build
PostPosted: Tue Feb 13, 2018 8:53 pm 
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Put a SOC in it!
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Joined: Mon Feb 07, 2005 4:48 pm
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Location: Fliptop Towers, North Yorks...the flat bit.
Car Model: One or two...
All the usual, as Melle says... Induction, fueling, exhaust, ignition... You've seen how to do it properly with Gavin's car... For a road car, stick to a twin choke carb on 2bbl manifold or even an adaptor block as I have on Rose's 96 :grin:

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